light · minimal · sans · bright · dense · structured
Plain
B2B support tool with a Dinamo grotesk and a single radioactive `#1ad379` action — Linear-restraint applied to support.
By webdesignhot · www.plain.com
$ npx design-md add plain
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Adidas Pure-black sport-utility, AdihausDIN/adidasFG uppercase, three-stripe geometry — the engineering canon for global sportswear. Adobe Creative-suite chrome — paper-white canvas, magenta-to-orange wordmark gradient, and Adobe Clean carrying every product grid. AgentKit Three swappable themes for AI agent products — editorial dark, daylight bright, fintech cool-blue. Airbnb Pure-white marketplace canvas with one Rausch coral and Cereal — generous photography, soft pills, modest type. Airtable White-canvas editorial workflow software with full-bleed coral and forest signature cards punctuating a near-black pill-CTA system. Alibaba Electric orange `#ff6a00` + dense merchant grids — the global B2B wholesale floor as a website. Amazon Smile-orange CTA, Amazon Ember sans, dense product grids — the canonical everything-store interface. Amazon Web Services Squid-ink navy with Smile-orange CTAs — the densest tile-portal on the cloud-platform internet. Anthropic Editorial broadsheet for AI safety — cream canvas, Anthropic Serif body, terracotta clay accent, magazine geometry. Apple White-canvas product theatre — SF Pro Text, 980px pill CTAs, and a single-blue accent system. Apple Music Pink-red gradient hero with album-grid kinesthetics — SF Pro precision, signature `#fa233b` brand pink, glassy dark canvas. Apple TV+ Pure-black cinematic theatre with SF Pro and ruthless minimalism — content as the only voice. Arc Browser-as-personality marketing — buttery cream canvas, Marlin Soft display, hand-tooled blue-and-coral palette. Are.na Bare grey-and-orange minimalism — a single Helvetica-class sans, hairline borders, and a stubborn refusal to optimise for engagement. Asana Approachable work management in soft purple — Asana Sans at modest weights with a rainbow accent palette and warm sky-tinted whitespace. Astro Cosmos navy canvas with violet-to-orange brand gradient — Mona Sans display, Inter body, Astro''s star-chart MPA framework dressed as an observatory dashboard. ASUS Republic of Gamers red `#cd0000` on black with bold sans — Taiwan engineering meets esports brutalism. Audi Vorsprung durch Technik on near-black — Audi Type sans, four-rings precision, and a near-monochrome canvas with `#bb0a30` reserved for sport. Auth0 Twilight-blue dark canvas with TWK Lausanne 300 display + Aeonik body — the original identity-platform aesthetic. Axiom Deep-navy observability with a cyan electric accent — Inter for body, JetBrains Mono for every event label, and a structural grid that reads as logs at planet scale. Axios Smart-brevity in chromatic form — blocky white canvas, Tiempos-flavored Atiza serif, signature `Why it matters:` time-bars and bullet-first prose. Base Coinbase-adjacent L2 minimalism — coinbaseSans on white, signature electric blue Baseten White canvas with Inter and a signature `#6c5ce7` purple — ML model deployment dressed in approachable workshop chrome. BBC News Signature BBC red (`#bb1919`), Reith Sans + Reith Serif, the global broadcaster authority typography of the world''s public-service news. Bear Off-white canvas, a custom bearsans display, a red bear icon, and tealish handwritten underlines — a Markdown notes app dressed as a Mac Pro magazine. beehiiv Aggressive black-on-yellow newsletter punch — heavy display sans, hyper-flat cards, and a `#ffd60a` highway-yellow that reads like a tabloid front page. Binance Trading-floor near-black with a single high-voltage Binance Yellow doing all the brand work — BinanceNova for type, BinancePlex for numbers. Bloomberg Iconic black-orange financial broadsheet — BWHaasHead headlines, AvenirNextPForBBG chrome, terminal-grade data density. Bluesky Sky-blue `#0085ff` on bright white with Inter sans — the AT-Protocol social network rendered as airy, federated, open. Blur Pure-black canvas, neon `#ff8700` orange voltage, and JetBrains-Mono-default everywhere — brutalist NFT trader terminal as competitive instrument. BMW Corporate-blue calm — BMW Type Next on a cream-tinted white, dark navy hero bands, and the M-stripe triplet in reserve. BMW M Performance black on M-blue/M-violet/M-red — the motorsport variant that turns BMW corporate into track-day theatre. Booking.com Deep-blue commerce engine — Bookin Sans on white, yellow CTA voltage, dense booking-funnel maximalism. Bose Pure black canvas, Helvetica restraint, and premium-audio confidence — sound presented as engineering art. Brex Cool grey-blue surfaces, magenta-to-purple-to-indigo gradient, Söhne 600 — fintech as fast, modern, slightly flashy. Bugatti French-engineered austerity — pure black canvas, three Bugatti typefaces, and full-bleed photography as the only voltage. Bun Cream canvas with chunky pink accents and the wide-eyed mascot — a JS runtime dressed as a 1970s bakery sign. Cal.com Open-source calendly with one bold custom font — Cal Sans on a soft `#f4f4f4` paper canvas. Calm Signature `#0066ff` deep blue + Aktiv Grotesk + meditation-deep cool atmospheric calm. Capacities Cream-yellow canvas, Inter at 700 with a Crimson Pro serif fallback, and a yellow underline as page ornament — a PKM that thinks like a sketchbook. Cartesia Bright clinical white with a single deep-blue action — voice-AI presented as scientific instrument rather than consumer product. Cash App Electric `#00d54b` green on near-black, Cash Sans monospace-flavoured geometry, and p2p-money youth aesthetic. Character.AI Cool zinc canvas, custom atHauss sans, and dark pill CTAs — a roleplay social product dressed in TikTok-grade neutrality. Chevrolet Gold-cross American classic — Louis sans on white with a `#cd9834` bowtie, a `#003876` corporate blue, and Camaro/Corvette red drama in reserve. Claude.ai Cream paper canvas, Anthropic Sans for body and Anthropic Serif for the headline — an AI assistant set in literary type. Clerk Geist + Suisse on near-black canvas with `#6c47ff` violet CTA — the drop-in-auth dev-tool aesthetic. ClickHouse Near-pure black canvas with electric yellow as the brand voltage — database performance dressed in voltmeter chrome. Cloudinary Media-API technical infrastructure in confident blue — Inter at modest weights with a deep navy-blue brand and a single chromatic accent for media moments. Cohere Stark white editorial canvas with deep green-black product bands and a CohereText/Unica77 type split. Coinbase Institutional-grade calm — pure white canvas, a single Coinbase Blue, and Coinbase Display set at weight 400 instead of 700. Composio Near-black canvas with deep-electric-blue voltage and a 2x2 terminal-mockup hero — agent infrastructure dressed as developer instrumentation. Corsair Yellow `#ffff00` lightning on black with Roboto — RGB-everything peripherals and PC components. Costco Warehouse blue + signature red, Helvetica utilitarian — bulk-buying signage translated to web. Coursera University-blue `#0056d2` on warm-white parchment with Source Sans — the canonical online-degree marketplace. Cursor Warm cream IDE-marketing — `#f7f7f4` canvas, `#26251e` ink, custom CursorGothic display, JetBrains Mono code, vivid orange accent. Datadog NationalWeb on white with the iconic `#632ca6` purple — observability dressed as an enterprise dashboard, structurally dense, chromatically restrained, multicolour where the data demands it. Deel A warm dark canvas with electric coral and orange accents — global payroll dressed as a confident product portrait. DeepSeek Deep-blue Chinese-tech minimalism — a research lab dressed in `#4d6bfe` and stark white space. Dell Pragmatic blue `#007db8` with custom Roboto-derivative — business-first PC commerce since the dorm room. Deno Inkwell black on warm white with the dinosaur mascot — TypeScript runtime as Eric Carle children's book. Descript Cream-pink canvas, a custom Brett display serif, and a wine-dark CTA — an AI video editor that ships like a magazine. Discord Indigo-ground hangout — gg sans body, ABC Ginto Nord display, 12-16px tile radii, white pill CTAs. Disney+ Deep navy gradient streaming hall with custom Inspire display sans and the unmistakable Disney+ wordmark arc. DoorDash Signature red-orange CTA, custom DoorDash Sans, delivery-funnel commerce — the dominant on-demand local marketplace. ElevenLabs Near-black voice-tech ground with white voice-wave aesthetic — Inter at studio scale, pill CTAs, and a single saturated accent that reads as both wayfinding and brand. Epic Games Pure-black canvas with custom Brutal Type / Heading Now display — Fortnite-saturated marketing meets PC-storefront merchandising. Ethereum Off-white canvas, ethereum-blue `#1c64f2` voltage, and Inter + serif duet — community-owned protocol as open documentation. Etsy Burnt-orange CTA, Graphik humanist sans, handcrafted-warmth aesthetic — the marketplace for makers and small batch. Excalidraw Literal hand-drawn whiteboard — wobbly SVG strokes, Virgil-style handwriting, and a deliberately primitive UI that turns digital sketching into nostalgia. Expedia Navy commerce + Mango yellow voltage — Expedia Sans, dense travel-funnel density with One Key loyalty colour-coding. Fantastical White paper, Effra geometric sans, full-round blue pills, and a rainbow of app-icon glass squares — a calendar app marketed like Apple''s Pro Apps. Ferrari Cinematic editorial in near-black — Rosso Corsa restraint, FerrariSans 500, and full-bleed cavallino photography. Figma Bright multi-color section bands with figmaSans display and figmaMono eyebrows — a marketing site that designs in scenes. Financial Times Salmon-pink page (`#fff1e5`) — the world''s most recognizable newspaper background, paired with Financier display + MetricWeb sans for global markets coverage. Fireworks AI Light canvas with Inter sans and a signature `#6720ff` purple-amber-orange spark — fast-inference platform dressed in speed-of-light kinetic chrome. Fly.io Mackinac display + Fragment Mono on a violet-saturated canvas — a PaaS that dresses like a small-press magazine. Ford American-truck heritage in corporate blue — Antenna sans, oval-script wordmark, and a deep `#003478` voltage that has carried the brand since 1927. Framer Black-on-white maximalism with electric gradient floods — Inter Display at heroic sizes, motion as a first-class material. Frontegg PP Neue Machina display + Neue Montreal body — plug-and-play user-management with deep-blue gravitas. Gemini (Google) Blue-into-violet gradient, Google Sans, soft Material 3 surfaces — Google''s house style applied to a chat interface. Ghost Warm-cream content CMS aesthetic — Inter for chrome, a soft serif for the writing surface, and a single confident green for action. GitHub Dark-canvas developer-platform marketing — Mona Sans variable headings, lime-green accent, near-black ground. GitHub Copilot Pure-white canvas, pure-black inverted CTAs, Mona Sans display — GitHub's editorial confidence applied to AI tooling. Grafana Dark observability canvas with the iconic `#f46800` orange — Inter for body, Roboto Mono everywhere a label hides, multi-colour chart palette ripped straight from a real dashboard. Granola White paper, a custom Quadrant book serif, and an olive-green CTA — an AI notepad that dresses like a stationery shop. Grubhub Friendly red-orange CTA, Sentinel display + Avenir body, dense delivery-app commerce — the long-running incumbent. HashiCorp Black canvas hosting a per-product color portfolio — Terraform purple, Vault yellow, Consul red, Waypoint cyan — multi-product identity made literal. Hashnode Developer publishing platform — deep navy canvas, electric blue brand, Inter sans + JetBrains Mono code chrome. HBO Max Deep purple-black premium streaming canvas with custom Sharp Grotesk and the unmistakable Max wordmark. Headspace Signature `#ffac1d` orange + custom round display + meditation-friendly playful warmth. Height AI-PM workspace dressed in chalk pastels — Inter at modest weights over a near-paper canvas, with a single confident accent and an AI-purple voltage moment. Honda Reliability-first restraint — HondaGlobalFont on white, signature red HP Cyan-blue `#0096d6` HP-circle on white with Forma DJR — the 84-year-old technology brand''s mainstream face. Hugging Face AI community canvas — deep blue-black ground, Source Sans Pro headlines, pill auth + 8px tile cards. Hulu Near-black canvas anchored on Hulu Green `#1ce783` with Graphik sans — the bright, cable-meets-streaming UI. IBM Carbon Design System made literal — pure-white canvas, IBM Plex Sans at light 300, square corners, and one assertive `#0f62fe` blue. Ideogram A bright white canvas with a single saturated violet cue — a typography-first AI image tool that lets the gallery do all the talking. Instacart Grocery-shopping-list practical — Instacart Sans on white, signature carrot green Kagi A premium search engine dressed in warm cream and Plex — the indie answer to ad-funded search. KAYAK Burnt-orange flight-search density — Open Sans on white, comparison-engine maximalism, price-graph data viz. Khan Academy Signature `#14bf96` mint green on white with Lato sans — free-for-everyone education in a warm, encouraging register. Kinde White canvas with Inter 72/500 display + dev-friendly pink-coral accent — the approachable auth-billing-access platform. Kit A cream newsletter canvas with a custom KitSans display, a Libre Franklin secondary, and a pastel-rainbow chip set — the editorial register reborn from ConvertKit. Kraken Kraken Purple `#7132f5` on white — Kraken-Brand display + Kraken-Product UI for a calmer, less-bombastic crypto exchange. Krea A pure-black studio with Suisse Intl set quietly at 60px — a creative-AI gallery that lets the work and the cobalt CTA carry the colour. Lamborghini Cathedral of darkness — true black canvas, Lamborghini Gold accents, and LamboType angled-terminal display. LangChain Deep navy canvas with Inter precision and a quietly confident teal accent — agent orchestration dressed as engineering documentation. Linear Dark-canvas product surface — pure-black ground, indigo accent, custom Inter weights, pill CTAs. LiveKit Realtime audio-video infra — Public Sans 300 weight on near-black, signature cyan LlamaIndex White canvas with Inter and a signature `#1b9aff` blue — RAG infrastructure dressed as a clean technical reference card. Logitech Soft consumer-tech blue gradients with Brown sans — design for the way you work, play, and create. Lovable Pink-into-violet gradient on white — vibe-coding dressed in playful, friendly chromatics. Magic Eden Mint-cream canvas, magenta-mint accent duet, and a custom Foundry display — Solana-native marketplace as boutique gallery. Mailchimp Cavendish-yellow chunkiness — a custom display serif (Cooper Light), the signature `#ffe01b` block, and a brand voice that hugs you while it ships campaigns. Mastercard Cream-canvas editorial fintech, circular-portrait orbits, MarkForMC at 450 weight — institutional-but-warm payments brand. MasterClass Pure-black cinema with custom display serif and editorial reverence — celebrity-instructor learning as a premium streaming product. Medium Editorial reading-first publishing — magazine-grade serif body, GT Super display, signature green-on-white pill CTAs. Mercedes-Benz Three-pointed-star authority — MBCorpo on near-black canvas, silver-blue Mercury A near-pure white canvas with a literary serif headline and a signature mercury-mint accent — banking dressed as a quiet magazine. Meta Optimistic blue (#0467df) on a white corporate canvas — Optimistic Display headlines, generous space, social-platform conglomerate at rest. Microsoft Fluent surfaces — off-white canvas, Segoe UI Variable Display, and a Cortana-blue action color carrying every product. Midjourney A deep cosmic canvas where JetBrains Mono headlines float over a wide-gamut OKLCH rainbow — a research lab dressed as a chapel. MiniMax Stark monochrome canvas broken open by vibrant gradient product cards — coral, magenta, blue, purple as model identity. Mintlify Documentation-platform marketing — pure white canvas, mint-green accent, Inter at tight tracking, near-black pill CTAs. Miro Canary-yellow Mistral Butter-yellow canvas, Arial as a deliberate anti-tech statement, and zero-radius rectangles — French AI as a brutalist art-school manifesto. Modal Serverless GPU infra in lime-green — `#0c0c0c` canvas, electric `#7fee64` accent, custom Modal Mono on every chip and code block. Monday.com Project management in confident red-pink — Poppins display at bold weights with a colorful saturated palette and a playfully energetic visual rhythm. MongoDB Signature MongoDB green Motion AI-calendar productivity in green-and-purple — Inter at modest weights with a green-to-purple voltage gradient signaling the AI scheduler, anchored by a clean white canvas. MSI Dragon-red `#ff0000` on jet black with bold display sans — the Taipei dragon-heritage gaming hardware brand. Mux Video API for developers — Aeonik on light-cream, Rotonto display, JetBrainsMono CTAs, sharp 0px corners. Neon Serverless Postgres dressed in late-night green — a near-black canvas with a single electric mint accent. Netflix Pure-black streaming theatre with signature `#e50914` red and Netflix Sans — the canonical media-tile grid. Nike Pure black, pure white, Helvetica Now — pill CTAs and full-bleed athletic photography on a single soft cloud gray. Notion Off-white canvas with Lyon serif accents and a custom NotionInter — a workspace dressed as a literary magazine. Nuxt Forest-green `#00dc82` glow on a near-black canvas — Vue-flavored warmth dressed for the cosmos. NVIDIA Engineering-grade canvas — pure black hero / paper-white body / one violently saturated `#76b900` green that carries every CTA and corner square. Omnivore Open-source read-it-later — near-white reading canvas, focused emerald-on-paper brand, archival elegance after the Eleven Labs sunset. OpenAI Pure white canvas, OpenAI Sans set in calm 500-weight, and a single black pill for the only action that matters — try ChatGPT. OpenRouter Pure-black canvas with custom display typography and pragmatic mono — LLM-router infrastructure dressed as a terminal billing dashboard. OpenSea Pure-black canvas, electric `#2081e2` blue, and Inter at trader-pro density — the original NFT marketplace as financial terminal. Optimism Pure-white canvas, signature `#ff0420` red voltage, and Inter at confident L2 register — Ethereum rollup as bold optimistic infrastructure. Ory White canvas with Inter 48/400 display + signature deep-navy `#0f172a` CTA — open-source-first identity for technical teams. Oura Pure-black canvas with Inter precision and gold-stamped scores — the premium-ring health-precision aesthetic. Paper Website A literal sheet-of-paper website — single literary serif, off-white sheet canvas, narrow reading columns, ink-blue links. PayPal Dual-blue corporate trust — PayPal Sans Big over white, with a deep-navy ink and a sky-blue counterpoint. Peloton Signature `#cb1e4e` red on midnight ink, Inter display, instructor-led premium-fitness storefront. Perplexity Cream paper canvas, custom pplxSans, and the unmistakable Tropic-cyan accent — a reference-library answer engine dressed in warm tones. Pinecone White canvas with Inter and a signature `#1cb0d0` cyan — vector database technical-marketing dressed in clean blueprint chrome. Plaid Pale blue trust on white, classical Stripe-adjacent type, and a Benjamin-Franklin-as-mascot moment of personality. PlanetScale Pure-black canvas, blood-red accent, mono-set numerals — a database brand styled like a financial terminal. Polar Dev-tool obsidian — 8rem editorial display headlines, indigo accents, Louize serif moments. Polygon Deep purple `#8247e5` voltage, soft surface ladder, and Inter at enterprise calm — Ethereum L2 as institutional infrastructure. Porsche Engineering-purity black-on-white — Porsche Next at 96px regular, Rosso PostHog Cream-canvas analytics with mustard-yellow CTAs and IBM Plex — open-source craft, not SaaS gloss. Postmark Postal-yellow #ffde00 + warm-black #1c1d1f + paper-white canvas — the transactional email API designed like a friendly post office sign. Prime Video Amazon-blue streaming canvas with Ember sans and the dense, utility-first marketplace UI vocabulary. PropelAuth White canvas with SF Pro Rounded display 60/900 + deep-navy ink — B2B multi-tenant auth with Apple-tinted polish. Qwik Electric purple-to-blue gradient on near-black — resumable execution dressed as a lightning bolt. Railway Ship software peacefully — IBM Plex Serif headlines on a deep eggplant canvas, with a single confident violet for action. Raindrop.io White paper, system-ui sans, soft watercolor blob backgrounds, and a vivid `#0b7ed0` blue CTA — a bookmark manager that ships like a creative-tool sketch. Ramp Off-yellow `#fcfb70` and black-on-white editorial — finance ops dressed as a printed annual report. Raycast Near-black canvas, glowing keycaps, monospaced shortcut chips — a marketing site that thinks like a launcher. Razer Neon `#44d62c` snake-green on jet black with Roboto — the For Gamers, By Gamers visual signature. Readwise Pastel-orange book-club warmth — soft cream canvas, friendly Tiempos serif accents, and a tangerine that signals 'this is your library.' Reddit Front-page-of-the-internet orange — community-card density, IBM Plex Sans display, and a confident Remix Signature `#3992ff` blue on pure white with Inter — a nested-routes web framework dressed as a manifesto poster. Render Lavender on white — a PaaS that swapped Heroku purple for a candy-bright #8a05ff and kept the airy whitespace. Replicate AI-API marketing — light page chrome, dark hero canvas, rb-Freigeist Neue display, JetBrains Mono code, sharp 0px corners. Replit Saturated turquoise on `#0e1525` ink — the cloud-IDE aesthetic with IBM Plex DNA and a JetBrains Mono soul. Resend Pure-black canvas with Domaine Display serif at 96px and Commit Mono code chips — email infra that thinks in italics. Retool Pragmatic blue #3a55fc + Inter + dense product mocks — the internal-tool platform that designed itself like a well-organised admin panel. Reuters Global newswire restraint — signature orange (`#ff8000`), Knowledge Medium custom sans, broadsheet rigor for the world''s oldest news agency. Riot Games Crimson `#d13639` red on near-black with custom Riot Beam display — esports-tournament drama and competitive-MOBA editorial. Rive Chunky animated display type and saturated playful colour — interactive graphics platform that wears its motion design on its sleeve. Roblox Bright `#ed1d24` red on white with Builder Sans — the youth-block-builder playground turned multi-billion-game social platform. RunPod Deep slate canvas with Inter and a signature `#673ab7` purple — accessible GPU cloud dressed in friendly developer chrome. Runway A near-black research canvas with ABC Normal headlines pulled tight at -2.5px — a film studio, an ML lab, and a brutalist gallery in one shell. Salesforce Cloud-trust dashboards — Salesforce Sans on a sky-blue ground, with Astro the bear standing guard over a dense CRM portal. SAP Enterprise-ERP precision in cobalt — SAP72 sans, signal-blue accents, and a calm white canvas built for trust. Segment Twilio Segment's customer-data-platform canvas — Whitney SSm humanist sans, navy-on-white, single confident `#1866ee` blue. Semafor Paper-cream canvas (`#f8f5d7`) with FeatureFlatHeadline serif and signature flag-style topic columns — global-news editorial built for the post-Twitter era. SendGrid Functional API-blue on white — the email-platform dashboard aesthetic, now folded under the Twilio umbrella. Sentry Deep-aubergine observability — Dammit Sans display, Rubik body, JetBrains Mono code, signature violet #7553ff and pill CTAs. shadcn/ui Copy-paste components in pure black-on-white — the most influential design system not actually shipped as a library. Shopify Dark-first commerce theatre — 96px NeueHaasGrotesk at weight 330, electric mint focus rings, and stacked multi-layer shadows. Signal Privacy-first messaging in `#3a76f0` Signal blue with Inter sans — minimal, ad-free, end-to-end-encrypted by default. Slack Aubergine workspace marketing — Salesforce-Avant-Garde headlines, all-caps 4px CTAs, white canvas with `#4a154b` accents. SolidJS Deep navy with a blue-to-cyan brand gradient — reactive primitives dressed as a circuit diagram. Sonos Pure black canvas, Inter typography, and audio-system minimalism — speakers presented as gallery objects. SoundCloud Signature `#ff5500` orange on `#f2f2f2` paper with Interstate sans — waveform-first audio social UI. SpaceX Pure-black cinematic photography, D-DIN aerospace stencil type, ghost-button minimalism — the interface disappears. Spotify Electric `#1ed760` green on near-black canvas with Spotify Mix sans — the canonical streaming-audio tile grid. Square Pure black on pure white, Square Sans grids, and retail-POS minimalism — commerce as black-and-white geometry. Starbucks Forest-green storefront — SoDoSans, full-pill buttons, warm-cream canvas, and a floating Frap CTA the brand calls home. Steam Deep blue-gray `#1b2838` with Motiva Sans — the utilitarian PC-gaming library that runs the world's largest digital storefront. SteelSeries Esports orange `#ff6900` on near-black with Inter — Danish precision peripherals for competitive play. Strava Signature `#fc4c02` orange + Inter on white — endurance-athlete data-driven storefront with map-overlay heritage. Stripe Editorial fintech polish — light Söhne headlines at weight 300, navy-not-black text, signature `#533afd` purple CTAs. Stytch Paper-cream canvas with Booton display + Chivo Mono body — passwordless-modern auth, joined Twilio. Substack Magazine-on-the-internet — Spectral serif body at 19px, Cahuenga display, signature `#ff6719` orange CTAs. Suno A near-black booth with cream Neue Montreal and a hot-pink cue light — a music studio, a record sleeve, and a chat app fused into one canvas. Sunsama Thoughtful daily planning in warm cream and ink — Inter at modest weights over a paper-cream canvas with sage and rose accents and a calm, unhurried voice. Supabase Off-black canvas, signature emerald `#3ecf8e`, Circular as display, Postgres-grade type discipline. Superhuman White paper canvas, a custom Super Sans variable, and a single confident lavender — premium email dressed as a stationery brand. Supreme Box-logo red, Courier monospace, skate-deadpan minimalism — the most influential streetwear store on the web. Svelte Hot orange #ff3e00 against clean white with a confident sans — the framework that wears its flame as a wordmark. Tailwind CSS The system applied to itself — Inter Variable on white canvas, signature cyan #06b6d4, every component built from Tailwind utilities. Tana Pure black canvas, a custom tanaClassic serif at 83px, and a pale-pistachio CTA — a knowledge graph dressed as a literary supplement. Target Bullseye red CTA, Helvetica Neue, photographic hero — friendly mass-market design with confident chromatic restraint. Telegram Cloud-blue messaging — Tesla Cinematic showroom on white — one Electric Blue CTA, Universal Sans, and viewport-height car photography. The Atlantic Modern serif headlines on cream-paper, signature Atlantic orange `#fbb33b`, long-form magazine reading rendered for the web. The Economist Deep cinnabar red `#e3120b`, Milo serif body, Econ Sans labels — the global-affairs weekly rendered with cover-illustration discipline. The Guardian Guardian Egyptian slab serif, signature navy `#052962`, structured ruled hierarchy with bold section accents. The New York Times Cheltenham serif headlines on paper-white, signature breaking-news red, the canonical American broadsheet rendered for the web. The New Yorker Adobe Caslon Pro + Irvin headline cap — a century of editorial gravitas in cream paper, ink black, and signature cartoon line. The Washington Post Postoni serif blackletter masthead, "Democracy Dies in Darkness" tagline, sober ink-on-paper political broadsheet. Things Cool light-blue canvas, system-ui sans, vivid Things-blue accent — a task manager that ships like an Apple Pro Display. Threads Instagram-adjacent text-first social — pure-black canvas, system-sans clarity, and a quiet brand restraint built from the @ glyph alone. TikTok Electric cyan-magenta on pure black — vertical-video voltage with custom Proxima Nova display and a bold neon brand grammar. tldraw Casual whiteboard sketchy — hand-drawn UI primitives, dotted-grid canvas, and a soft pastel palette that wears its toy-like energy with confidence. Together AI Deep navy on near-white with Inter sans — open-source LLM cloud rendered as developer-platform infrastructure. Toyota Japanese-reliability mainstream — `#eb0a1e` Toyota red on white, ToyotaType sans, and a calm-confident marketing surface for the world's most-sold automotive brand. Turbo Vercel-grade pure-black canvas with a magenta-to-blue Turbo gradient — the build system that wears its speed as a sweep. Turso SQLite at the edge — a deep-teal canvas with a CRT-bright cyan accent (#00face) that reads as a glowing edge node. Twilio Signal-red `#f22f46` against clean white — communications APIs given the visual weight of a broadcast colour. Twitch Purple `#9146ff` on `#0e0e10` canvas with Inter — the live-streaming UI built around chat, raids, and gaming density. Uber Eats Pure-black ground, Uber Move custom sans, Uber-app continuity — the operating system of food delivery. Udemy Signature `#a435f0` purple on white with Sailec sans — the open course-marketplace bazaar made approachable. Uniqlo Signature red `#ff0000`, Helvetica Neue system stack, japanese-utility-functional grid — the LifeWear engine. v0 A near-white prompt canvas with GeistSans and pure OKLCH grayscale — Vercel''s AI builder dressed as the calmest text editor on the internet. Venmo A single confident `#3d95ce` blue, Aktiv Grotesk geometry, and a social-feed informality — payments dressed as group chat. Vercel Brutalist developer-product polish — near-white canvas, near-pure black-on-near-white type, Geist sans + mono, conic-gradient accents. Vite Electric purple #646cff + Manrope display + a literal lightning-bolt mark — the build tool that designed itself to feel as fast as it is. Vodafone Vodafone Red broadcast band, monumental 144px display, two-tier button system — corporate-newsroom telecom design. Volkswagen People's-car blue — the deep `#001e50` corporate hue, custom VW Sans, and a friendly-German marketing surface that sells everyday mobility with confidence. Walmart Spark-yellow on big-box blue, Antonio Display + Bogle sans — everyday low prices made loud. Warp Near-black canvas, neon-lime cursor, real terminal screenshots — a marketing site that boots like a shell. Weaviate White canvas with Inter and a signature `#1cdb46` open-source green — modular vector database dressed in approachable engineering chrome. webdesignhot AI-era editorial dark — pure black with one acid-lime accent. Webflow Indigo-to-purple gradient discipline with a precise structural sans — the visual builder that markets itself like a design conference. WHOOP Lime `#a0d10b` voltage on jet-black, Inter precision, recovery-data athlete-grade aesthetic. WIRED Newsstand-density editorial grid, sharp-corner buttons, mono ALL-CAPS kickers — Conde Nast meets engineering lab. Wise A flexible bright-lime green on cream-white — money that travels in sans-serif and a single confident accent. Workday HR-warm professional in tangerine — Adelle Sans humanist curves, signature `#f37721` orange, and a calm white people-first canvas. WorkOS Pure-white canvas with Untitled Sans 80/500 display + indigo-violet h2 — the B2B-enterprise gravitas aesthetic. X Pure-black canvas with Chirp display — algorithmic minimalism, single-letter wordmark, ruthless type discipline. Y Combinator Brutalist orange monolith — system-font sans on white canvas, signature `#f26625` orange-red blocks with hard 0px corners. You.com Crisp white developer-doc canvas, custom Lumen Sans, and the indigo `#5368EE` accent — a search API rebrand done as enterprise infrastructure. YouTube YouTube Sans + Roboto + signature `#ff0000` red — content-density at planetary scale. Zora Cream-white canvas, electric purple-orange duet, and a custom display — onchain creator network as zine cover.
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Tokens design.md/v1.5
- bg
#ffffff - bg-secondary
#f5f5f5 - bg-tertiary
#fafafa - surface
#ffffff - surface-elev
#fafafa - text AAA · 21.0
#000000 - text-strong
#000000 - text-medium
#1a1a1a - text-soft
#5b5b5b - text-faint AA·LG · 3.5
#8a8a8a - text-muted
#b8b8b8 - brand — · 2.0
#1ad379 - brand-hover
#0fb866 - brand-deep
#0a8f4f - brand-soft
#e8faf0 - brand-tint
#b8f0d2 - on-brand
#000000 - cta-bg
#1ad379 - cta-text
#000000 - link
#000000 - link-hover
#1ad379 - selected-bg
#f5f5f5 - disabled
#b8b8b8 - border — · 1.2
rgba(0, 0, 0, 0.08) - border-strong — · 1.5
rgba(0, 0, 0, 0.16) - border-subtle
rgba(0, 0, 0, 0.04) - border-brand
rgba(26, 211, 121, 0.30) - success-bg
#e8faf0 - success-text
#0a8f4f - warning-bg
#fff4e0 - warning-text
#7a4a00 - danger-bg
#fde6e6 - danger-text
#a82020 - info-bg
#eef2f7 - info-text
#1a1a1a
Ship faster than ever.
display-hero "ABC Favorit" 96px w400 -0.025em
Ship faster than ever.
display "ABC Favorit" 80px w400 -0.02em
Ship faster than ever.
h1 "ABC Favorit" 64px w400 -0.02em
Built for teams that ship.
h2 "ABC Favorit" 48px w400 -0.015em
A complete kit
h3 "ABC Favorit" 32px w500 -0.01em
The quick brown fox jumps over the lazy dog.
quote-pull "ABC Favorit" 28px w400 -0.01em
The quick brown fox jumps over the lazy dog.
h4 "ABC Favorit" 22px w500
The quick brown fox jumps over the lazy dog.
body-large "ABC Favorit" 20px w400
The quick brown fox jumps over the lazy dog.
h5 "ABC Favorit" 18px w500
The quick brown fox jumps over the lazy dog.
body "ABC Favorit" 16px w400
The quick brown fox jumps over the lazy dog.
body-small "ABC Favorit" 14px w400
npx design-md add linear
code "ABC Favorit Mono" 14px w400
OUR DESIGN SYSTEM
caption "ABC Favorit" 13px w400
The quick brown fox jumps over the lazy dog.
button "ABC Favorit" 13px w700 0.06em
The quick brown fox jumps over the lazy dog.
eyebrow "ABC Favorit Mono" 12px w500 0.08em
OUR DESIGN SYSTEM
caption-tabular "ABC Favorit Mono" 12px w500
OUR DESIGN SYSTEM
label "ABC Favorit Mono" 11px w500
npx design-md add linear
code-micro "ABC Favorit Mono" 11px w400
- step-0 1px
- step-1 2px
- step-2 4px
- step-3 6px
- step-4 8px
- step-5 12px
- step-6 16px
- step-7 24px
- step-8 32px
- step-9 48px
- step-10 64px
- step-11 96px
- step-12 128px
- step-13 160px
- micro
2px - sm
6px - md
6px - lg
8px - xl
12px - pill
9999px
Text link →
Card preview
A complete kit — everything your product needs.
Hero, pricing, FAQ, dashboard, docs — every layout your product needs.
New
Stable
v1.0
Plain runs the Linear playbook on a white canvas. The same restraint, the same single-accent commitment, the same type-led layout — but ported from Linear's dark Inter-Variable register into pure white + ABC Favorit + radioactive lime-green. Where Intercom-style support tools dominate the category with colorful, illustrated, slightly cute pages, Plain refuses the entire vocabulary. The "BOOK A DEMO" button is set in all-caps on a radioactive green that looks more like a Linear keyboard chip than a SaaS button. Combined with the Dinamo-licensed grotesk, the page reads as deeply intentional — the kind of restraint that signals to engineering buyers that the product itself will respect their attention. The headline lands at 80px in weight 400 (not 600 or 700) — the type's confidence signal: the form has enough character to hold the page without leaning on weight.
- The grotesk on the entire site; a design-conscious type choice that signals craft to the Linear-influenced audience
- Restrained-sans-plus-single-accent vocabulary; weight-400 headlines; minimalism as proof of product confidence — the direct visual ancestor
- White-canvas SaaS sibling; the modern reference for "type does the work, no illustration"
- Adjacent precedent for design-conscious B2B SaaS with single-accent discipline
- Direct competitor; Plain positions itself as the cleaner, more developer-shaped alternative. The visual differentiation is the entire pitch.
- Hairline-border restraint, single-accent confidence on a neutral canvas
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---
name: Plain
tagline: B2B support tool with a Dinamo grotesk and a single radioactive `#1ad379` action — Linear-restraint applied to support.
author: webdesignhot
source_url: https://www.plain.com
spec: design.md/v1.5
quality: curated
featured: false
categories: [saas, dev-tools]
tags: [light, minimal, sans, bright, dense, structured]
preview_swatch: ['#ffffff', '#1ad379', '#000000']
related: [linear, cal-com, vercel]
description: 'Plain is a Linear-style B2B support tool that pairs a custom Dinamo grotesk (`ABC Favorit`) at 80px against a single radioactive lime-green CTA. The whole identity rides on one typographic and one chromatic decision — Favorit on white with `#1ad379` accents. Where Intercom-style support tools dominate the category with colorful, illustrated, slightly cute pages, Plain refuses the entire vocabulary. The "BOOK A DEMO" button is set in all-caps, weight 700, on a radioactive green that looks more like a Linear keyboard chip than a SaaS marketing button. Combined with the Dinamo-licensed grotesk, the page reads as deeply intentional — the kind of restraint that signals to engineering buyers that the product itself will respect their attention. The headline lands at 80px in weight 400 (not 600 or 700) — the type''s confidence signal: the form has enough character to hold the page without leaning on weight. Black text on pure white, no warm tint, no off-white; the entire system runs on one type family (ABC Favorit), one accent color (`#1ad379`), one secondary tier (`#f5f5f5`) — and that''s the whole budget.'
colors:
# Primary
bg: '#ffffff' # pure white canvas, no warm tint
bg-secondary: '#f5f5f5' # the only secondary tier
bg-tertiary: '#fafafa' # subtle inset / hover ground
surface: '#ffffff' # cards = page surface (flat)
surface-elev: '#fafafa' # subtle lift over white
text: '#000000' # pure black headlines and body
text-strong: '#000000' # display / hero
text-medium: '#1a1a1a' # secondary heading
text-soft: '#5b5b5b' # captions, metadata, disabled
text-faint: '#8a8a8a' # eyebrows, helper text
text-muted: '#b8b8b8' # placeholder, disabled microcopy
# Brand
brand: '#1ad379' # radioactive lime-green CTA
brand-hover: '#0fb866' # deeper green hover state
brand-deep: '#0a8f4f' # pressed-state green
brand-soft: '#e8faf0' # green wash for success bgs
brand-tint: '#b8f0d2' # green tint for chips
on-brand: '#000000' # black label on green (the signature)
cta-bg: '#1ad379' # primary CTA fill
cta-text: '#000000' # CTA text in black, all-caps
# Interactive
link: '#000000' # links default to black underlined
link-hover: '#1ad379' # green on hover only
selected-bg: '#f5f5f5' # selected nav state
disabled: '#b8b8b8'
# Borders
border: 'rgba(0, 0, 0, 0.08)' # default hairline
border-strong: 'rgba(0, 0, 0, 0.16)' # outlined buttons
border-subtle: 'rgba(0, 0, 0, 0.04)' # quietest separation
border-brand: 'rgba(26, 211, 121, 0.30)' # green-tinted hairline
# Semantic
success-bg: '#e8faf0' # green wash
success-text: '#0a8f4f'
warning-bg: '#fff4e0' # warm-amber wash
warning-text: '#7a4a00'
danger-bg: '#fde6e6' # soft-red wash
danger-text: '#a82020'
info-bg: '#eef2f7' # cool-grey wash (info reads as quiet, not blue)
info-text: '#1a1a1a'
typography:
display:
family: '"ABC Favorit", "ABC Favorit Regular", -apple-system, system-ui, sans-serif'
weights: [400, 500, 700]
opentype-features: ['liga', 'kern']
body:
family: '"ABC Favorit", -apple-system, system-ui, sans-serif'
weights: [400, 500]
opentype-features: ['liga', 'kern']
mono:
family: '"ABC Favorit Mono", ui-monospace, "SF Mono", monospace'
weights: [400, 500]
opentype-features: ['tnum', 'zero']
scale:
display-hero: { size: 96, weight: 400, lineHeight: 0.92, tracking: '-0.025em', family: display }
display: { size: 80, weight: 400, lineHeight: 0.95, tracking: '-0.02em', family: display }
h1: { size: 64, weight: 400, lineHeight: 1.0, tracking: '-0.02em', family: display }
h2: { size: 48, weight: 400, lineHeight: 1.05, tracking: '-0.015em', family: display }
h3: { size: 32, weight: 500, lineHeight: 1.15, tracking: '-0.01em', family: display }
h4: { size: 22, weight: 500, lineHeight: 1.25, family: display }
h5: { size: 18, weight: 500, lineHeight: 1.35, family: display }
eyebrow: { size: 12, weight: 500, lineHeight: 1.4, tracking: '0.08em', family: mono, transform: uppercase }
body-large: { size: 20, weight: 400, lineHeight: 1.5, family: body }
body: { size: 16, weight: 400, lineHeight: 1.5, family: body }
body-small: { size: 14, weight: 400, lineHeight: 1.5, family: body }
caption: { size: 13, weight: 400, lineHeight: 1.4, family: body }
caption-tabular: { size: 12, weight: 500, lineHeight: 1.4, family: mono, opentype: 'tnum' }
label: { size: 11, weight: 500, lineHeight: 1.3, family: mono, transform: uppercase }
button: { size: 13, weight: 700, lineHeight: 1.0, family: body, tracking: '0.06em', transform: uppercase }
code: { size: 14, weight: 400, lineHeight: 1.55, family: mono }
code-micro: { size: 11, weight: 400, lineHeight: 1.4, family: mono }
quote-pull: { size: 28, weight: 400, lineHeight: 1.25, tracking: '-0.01em', family: display }
radius:
micro: 2
sm: 6
md: 6
lg: 8
xl: 12
pill: 9999
spacing:
base: 4
scale: [1, 2, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 160]
layout:
page-width: 1200
prose-width: 680
site-gutter: 'clamp(24px, 5vw, 64px)'
header-height: 64
grid-columns: 12
section-rhythm: '96-128px'
components:
button-primary:
background: '#1ad379'
text: '#000000'
padding: '14px 24px'
radius: 6
border: 'none'
font: 'ABC Favorit 700 / 13px / uppercase / 0.06em tracking'
hover-bg: '#0fb866'
active-bg: '#0a8f4f'
use: 'Primary action — radioactive green pill rect with all-caps black label; the whole brand budget'
button-secondary:
background: 'transparent'
text: '#000000'
padding: '14px 24px'
radius: 6
border: '1px solid rgba(0, 0, 0, 0.16)'
font: 'ABC Favorit 700 / 13px / uppercase / 0.06em tracking'
hover-bg: 'rgba(0, 0, 0, 0.04)'
use: 'Outlined twin — same shape, no fill, all-caps copy maintained'
button-black:
background: '#000000'
text: '#ffffff'
padding: '14px 24px'
radius: 6
font: 'ABC Favorit 700 / 13px / uppercase / 0.06em tracking'
hover-bg: '#1a1a1a'
use: 'Rare black CTA — alternate primary on green-emphasis pages where the green is already used elsewhere'
button-ghost:
background: 'transparent'
text: '#000000'
padding: '8px 12px'
font: 'ABC Favorit 500 / 14px'
hover-text: '#1ad379'
use: 'Quiet third action — nav links, footer, repeated CTAs'
card:
background: '#ffffff'
border: '1px solid rgba(0, 0, 0, 0.08)'
radius: 8
padding: '24px'
use: 'Default feature card — flat panel, hairline border, no shadow'
card-grey:
background: '#f5f5f5'
border: 'none'
radius: 8
padding: '32px'
use: 'Inset card for testimonials, code blocks, quoted callouts'
input:
background: '#ffffff'
border: '1px solid rgba(0, 0, 0, 0.16)'
radius: 6
padding: '12px 14px'
font: 'ABC Favorit 400 / 16px'
placeholder-color: '#8a8a8a'
focus-ring: '0 0 0 2px #1ad379'
use: 'Form fields, search, email capture'
badge-eyebrow:
background: 'transparent'
text: '#5b5b5b'
padding: '0'
font: 'ABC Favorit Mono 500 / 12px / uppercase / 0.08em'
use: 'Section eyebrow — mono caps, no chrome'
badge-status:
background: '#e8faf0'
text: '#0a8f4f'
padding: '4px 10px'
radius: 4
font: 'ABC Favorit 500 / 12px'
use: 'Status pill — green wash for active, neutral for default'
nav-link:
background: 'transparent'
text: '#000000'
padding: '8px 12px'
font: 'ABC Favorit 500 / 14px'
hover-text: '#1ad379'
motion:
ease-standard: 'cubic-bezier(0.4, 0, 0.2, 1)'
ease-emphasized: 'cubic-bezier(0.2, 0, 0, 1)'
ease-out: 'cubic-bezier(0.0, 0, 0.2, 1)'
duration-fast: 100
duration-standard: 180
duration-slow: 300
duration-page: 400
reduced-motion: 'respects prefers-reduced-motion: reduce — all transitions become opacity-only, durations halved'
breakpoints:
mobile: 640
tablet: 1024
desktop: 1200
wide: 1440
shadows:
none: 'none'
ambient: 'rgba(0, 0, 0, 0.04) 0 1px 3px'
standard: 'rgba(0, 0, 0, 0.06) 0 4px 12px'
elevated: 'rgba(0, 0, 0, 0.08) 0 12px 32px -8px'
popover: 'rgba(0, 0, 0, 0.10) 0 16px 40px -16px'
ring: '0 0 0 2px #1ad379'
accessibility:
contrast-text-on-bg: 21.0 # #000000 on #ffffff — AAA at all sizes (theoretical max)
contrast-text-on-brand: 9.5 # #000000 on #1ad379 — AAA at body sizes
contrast-text-soft-on-bg: 7.4 # #5b5b5b on #ffffff — AAA at body sizes
focus-ring: '2px solid #1ad379 with 2px offset'
reduced-motion-honored: true
keyboard-nav: 'visible focus on every interactive surface; tab order matches visual'
prose-line-length: 'capped at 680px for readability'
dark-mode: null # marketing surface is light-only; the radioactive green is calibrated for white only
lineage:
summary: 'Plain runs the Linear playbook on a white canvas. The same restraint, the same single-accent commitment, the same type-led layout — but ported from Linear''s dark Inter-Variable register into pure white + ABC Favorit + radioactive lime-green. Where Intercom-style support tools dominate the category with colorful, illustrated, slightly cute pages, Plain refuses the entire vocabulary. The "BOOK A DEMO" button is set in all-caps on a radioactive green that looks more like a Linear keyboard chip than a SaaS button. Combined with the Dinamo-licensed grotesk, the page reads as deeply intentional — the kind of restraint that signals to engineering buyers that the product itself will respect their attention. The headline lands at 80px in weight 400 (not 600 or 700) — the type''s confidence signal: the form has enough character to hold the page without leaning on weight.'
influences:
- name: 'Dinamo Typefaces (ABC Favorit)'
role: 'The grotesk on the entire site; a design-conscious type choice that signals craft to the Linear-influenced audience'
url: 'https://abcdinamo.com/typefaces/favorit'
- name: 'Linear'
role: 'Restrained-sans-plus-single-accent vocabulary; weight-400 headlines; minimalism as proof of product confidence — the direct visual ancestor'
url: 'https://linear.app'
- name: 'Vercel'
role: 'White-canvas SaaS sibling; the modern reference for "type does the work, no illustration"'
url: 'https://vercel.com'
- name: 'Cal.com'
role: 'Adjacent precedent for design-conscious B2B SaaS with single-accent discipline'
url: 'https://cal.com'
- name: 'Intercom'
role: 'Direct competitor; Plain positions itself as the cleaner, more developer-shaped alternative. The visual differentiation is the entire pitch.'
url: 'https://intercom.com'
- name: 'Stripe'
role: 'Hairline-border restraint, single-accent confidence on a neutral canvas'
url: 'https://stripe.com'
---
## 1. Visual Theme & Atmosphere
Plain runs the Linear playbook on a white canvas. The headline "Build support your way" is set in **ABC Favorit** (a Dinamo Typefaces grotesk) at 80px / weight 400 with `-0.02em` tracking — the same kind of typographic confidence Linear shows on its dark canvas, ported into B2B support software. The single chromatic event on the page is the lime-green `#1ad379` CTA — radioactive enough to stop the eye, restrained enough that nothing else competes with it. The "BOOK A DEMO" label sits in all-caps, weight 700, with `0.06em` letter-spacing — a deliberate enterprise-B2B register that reads more like a band poster than a SaaS marketing button.
What makes Plain distinctive is the *category positioning*. The customer-support tool category is dominated by Intercom-style colorful, illustrated, slightly cute pages: cartoon avatars, gradient hero sections, mascot illustrations, multiple brand colors. Plain refuses the entire vocabulary. The "BOOK A DEMO" button is set in all-caps on a radioactive green that looks more like a Linear keyboard chip than a SaaS button. Combined with the Dinamo-licensed grotesk, the page reads as deeply intentional — the kind of restraint that signals to engineering buyers that the product itself will respect their attention. Plain is targeting *Linear customers and similar developer-shaped support buyers*, and the marketing chrome is a self-selection filter.
The third register is the **discipline of weight 400 at 80px**. Most type-confident SaaS sites lean on weight 600 or 700 for hero copy — that's the Vercel/Mintlify/Linear convention. Plain pushes the headline to 80px (genuinely large, larger than Linear or Vercel's 48–64px hero) but keeps it at *weight 400*. The choice is the type's confidence signal: ABC Favorit has enough character — humanist proportions, the curved lowercase `g`, the angled stroke endings — to hold the page without leaning on weight. Going to 600 or 700 at 80px would feel shouty; staying at 400 reads as "the form alone is enough."
Atmospheric vocabulary that captures the feeling: *radioactive-green, all-caps-CTA, Dinamo-licensed, weight-400-confident, white-canvas-restraint, Linear-cousin, Intercom-rejection, support-for-engineers, type-does-the-work, no-illustration, single-accent-budget.* Every surface lands like it was designed by an engineering-design partnership that has read their Brian Eno and decided that subtraction is the move.
**Key Characteristics**
- Pure white `#ffffff` canvas — no warm tint, no off-white, no cream
- Custom **ABC Favorit** by Dinamo — humanist grotesk on the entire surface
- Single radioactive-green `#1ad379` accent — the whole chromatic budget
- All-caps, weight-700, `0.06em` letter-spacing CTAs — band-poster register
- Black text on green button — the signature inversion (most green CTAs use white text)
- Headline at 80px weight 400 — type confidence signal
- Two-tier surface (white + `#f5f5f5`) — minimal palette
- 6px button radius — smaller than the SaaS-pill convention
- ABC Favorit Mono cousin — code blocks share the parent family proportions
- 96–128px section gutters — generous, Linear-paced spacing
- No gradients, no illustrations, no mascots — pure type + accent + restraint
- Single-family discipline — display, body, mono all from the Favorit ecosystem
## 2. Color Palette & Roles
### Primary
- **bg** `#ffffff` — pure white canvas. No warm tint, no off-white, no cream.
- **text** `#000000` — pure black for headlines and body. Maximum contrast at 21:1.
- **bg-secondary** `#f5f5f5` — the *only* secondary surface tier. Used for code blocks, inset testimonials, quoted callouts.
- **bg-tertiary** `#fafafa` — subtle hover ground for nav, list rows.
- **on-brand** `#000000` — black label on green CTA. The signature inversion — most green CTAs in SaaS use white text; Plain's black text on radioactive green is what makes the button look like a Linear keyboard chip.
### Brand & Accent
- **brand** `#1ad379` — radioactive lime-green CTA. The whole chromatic budget. Reserved for the primary action and the brand wordmark; never spread to backgrounds, never used for non-action emphasis.
- **brand-hover** `#0fb866` — deeper green for hover state.
- **brand-deep** `#0a8f4f` — pressed-state and "success-text" colour.
- **brand-soft** `#e8faf0` — green wash for success backgrounds.
- **brand-tint** `#b8f0d2` — green tint for status chips.
### Interactive
- **link** `#000000` — body links default to black, underlined. Plain trusts that black-with-underline reads as a link.
- **link-hover** `#1ad379` — green on hover; the only chromatic transition.
- **selected-bg** `#f5f5f5` — selected nav state.
- **disabled** `#b8b8b8` — disabled control text.
### Neutral Scale
- **black** `#000000` — primary text and headlines.
- **near-black** `#1a1a1a` — secondary heading colour.
- **slate-soft** `#5b5b5b` — captions, metadata.
- **slate-faint** `#8a8a8a` — eyebrows, helper text, placeholder.
- **slate-muted** `#b8b8b8` — disabled microcopy.
The choice to use fixed hex values (rather than opacity-based scales like Mintlify) is deliberate: Plain is high-contrast-only, and the fixed neutrals never become ambiguous against tinted surfaces.
### Surface & Borders
- **surface-0 (page)** `#ffffff` pure white.
- **surface-1 (panel)** `#f5f5f5` light grey.
- **surface-2 (subtle)** `#fafafa` very light grey.
- **border** `rgba(0, 0, 0, 0.08)` — default hairline.
- **border-strong** `rgba(0, 0, 0, 0.16)` — outlined buttons.
- **border-subtle** `rgba(0, 0, 0, 0.04)` — quietest separation.
- **border-brand** `rgba(26, 211, 121, 0.30)` — green-tinted rule for brand emphasis.
### Shadow Colors
Plain uses **almost no shadows**. The two-tier surface system (white + `#f5f5f5`) provides all the depth — there are no shadows on cards, no drop-shadow on the hero, nothing that mimics a layered UI. The only "elevation" event on the page is the green CTA, and it elevates by colour, not by shadow. When shadows do appear (modals, popovers), they're tinted with low-opacity black at 6–10%, never blue-tinted. The brand reads as completely flat.
### Semantic
- **success** — bg `#e8faf0` (green wash), text `#0a8f4f` (deep green), border `rgba(26, 211, 121, 0.30)`. Note: success uses the brand green — single-accent discipline maintained.
- **warning** — bg `#fff4e0` (warm-amber wash), text `#7a4a00`, border `rgba(122, 74, 0, 0.25)`.
- **danger** — bg `#fde6e6` (soft-red wash), text `#a82020`, border `rgba(168, 32, 32, 0.30)`.
- **info** — bg `#eef2f7` (cool-grey wash), text `#1a1a1a` near-black. Note: info reads as *quiet* (grey), not blue — Plain rejects the info-blue convention because blue would be a second brand color.
## 3. Typography Rules
### Font Family
- **Display & Body**: `"ABC Favorit", "ABC Favorit Regular", -apple-system, system-ui, sans-serif` — Dinamo Typefaces' humanist grotesk. Used at 400 / 500 / 700. The defining type choice.
- **Mono**: `"ABC Favorit Mono", ui-monospace, "SF Mono", monospace` — the matched monospace cousin from the same Favorit ecosystem. Shares the parent family's proportions, keeping page texture consistent.
- **OpenType features**: `liga` and `kern` always on. `tnum` and `zero` enabled in mono for code tabular alignment.
- **The "ABC Favorit Regular" placeholder** is loaded as a fallback during font swap, signalling careful FOUT/FOIT engineering — a brand discipline tell for design-conscious developer buyers.
### Hierarchy
| Role | Font | Size | Weight | Line Height | Letter Spacing | OT Features | Notes |
|---|---|---|---|---|---|---|---|
| Display Hero | ABC Favorit | 96px | 400 | 0.92 | -0.025em | liga | Largest hero variant |
| Display | ABC Favorit | 80px | 400 | 0.95 | -0.02em | liga | The canonical Plain hero |
| H1 | ABC Favorit | 64px | 400 | 1.00 | -0.02em | liga | Page title |
| H2 | ABC Favorit | 48px | 400 | 1.05 | -0.015em | liga | Major section |
| H3 | ABC Favorit | 32px | 500 | 1.15 | -0.01em | — | Sub-section, weight steps to 500 |
| H4 | ABC Favorit | 22px | 500 | 1.25 | normal | — | Card heading |
| H5 | ABC Favorit | 18px | 500 | 1.35 | normal | — | Inline emphasis |
| Eyebrow | ABC Favorit Mono | 12px | 500 | 1.40 | 0.08em | uppercase | Section pre-label |
| Body Large | ABC Favorit | 20px | 400 | 1.50 | normal | — | Lede paragraph |
| Body | ABC Favorit | 16px | 400 | 1.50 | normal | — | Default paragraph copy |
| Body Small | ABC Favorit | 14px | 400 | 1.50 | normal | — | Captions, sidebars |
| Caption | ABC Favorit | 13px | 400 | 1.40 | normal | — | Image captions |
| Caption Tabular | ABC Favorit Mono | 12px | 500 | 1.40 | normal | tnum | Stats, data labels |
| Label | ABC Favorit Mono | 11px | 500 | 1.30 | uppercase | — | UI labels, mono caps |
| Button | ABC Favorit | 13px | 700 | 1.00 | 0.06em | uppercase | The all-caps CTA register |
| Pull Quote | ABC Favorit | 28px | 400 | 1.25 | -0.01em | — | Editorial pull-quote |
| Code | ABC Favorit Mono | 14px | 400 | 1.55 | normal | — | Inline + block |
| Code Micro | ABC Favorit Mono | 11px | 400 | 1.40 | normal | — | Footnote refs |
### Principles
- **Weight 400 at 80px is the brand's confidence signal.** ABC Favorit at 80px / 400 / `-0.02em` is the canonical Plain hero. Going to 600 or 700 at that size would feel shouty; 400 lets the form do the work.
- **Single-family discipline.** ABC Favorit and ABC Favorit Mono cover display, body, navigation, captions, code, eyebrows. Adding a serif or a second sans breaks the system entirely.
- **All-caps + 700 + `0.06em` for CTA copy only.** The "BOOK A DEMO" / "GET STARTED" register is reserved for primary action labels; body copy never goes all-caps.
- **Negative tracking compresses with size.** `-0.025em` at 96px, `-0.02em` at 64–80px, `-0.015em` at 48px, `-0.01em` at 28–32px, normal at 22px and below.
- **Hierarchy by size and color, not weight.** Body and headlines both default to 400; H3 steps to 500 only when the size doesn't carry enough difference.
- **Mono for eyebrows, not just code.** ABC Favorit Mono caps at 12px / `0.08em` tracking are Plain's section pre-labels — a Dinamo-signed signal of type discipline.
- **No italic in display.** Headlines never italicise. Body italics carry quoted titles only.
- **Self-hosted Favorit Variable.** The "ABC Favorit Regular" fallback shim is an engineering signal — Dinamo-licensed type, FOUT-prevented, served by the brand directly.
## 4. Component Stylings
### Buttons
**Primary (Radioactive Green)**
- Background: `#1ad379`. Text: `#000000`, ABC Favorit 700 / 13px / uppercase / `0.06em` tracking.
- Padding: `14px 24px`. Radius: `6px` — distinctly *not* a pill. Plain's CTA shape is a soft rectangle, distinguishing it from Linear's pill chips.
- Hover: bg → `#0fb866` (deeper green); transition `180ms ease-standard`. No lift, no scale.
- Active: bg → `#0a8f4f`.
- Use: Primary CTA — *BOOK A DEMO, GET STARTED, CONTACT SALES.* The whole brand budget — this is the only place radioactive green appears as a fill.
**Secondary (Outlined)**
- Background: transparent. Text: `#000000`. Border: `1px solid rgba(0, 0, 0, 0.16)`. Radius: `6px`.
- Same padding (14×24), font (ABC Favorit 700 / 13px / uppercase / 0.06em).
- Hover: bg → `rgba(0, 0, 0, 0.04)`.
- Use: Twin to primary — *WATCH THE DEMO, READ THE DOCS.* All-caps maintained.
**Black (Alternate Primary)**
- Background: `#000000`. Text: `#ffffff`. No border. 6px radius.
- Same shape and font as primary.
- Hover: bg → `#1a1a1a`.
- Use: Alternate primary on pages where the green is already used elsewhere (e.g. green logo lockup, green status indicator). Rare.
**Ghost (Quiet)**
- Background: transparent. Text: `#000000`. No border.
- Padding: `8px 12px`. ABC Favorit 500 / 14px (sentence case, not uppercase).
- Hover: text → `#1ad379` green.
- Use: Nav links, footer secondary actions.
### Cards
**Default Card (Flat)**
- Background: `#ffffff`. Border: `1px solid rgba(0, 0, 0, 0.08)`. Radius: `8px`. Padding: `24px`.
- Shadow: none.
- Hover: border → `rgba(0, 0, 0, 0.16)`; transition `180ms`.
- Use: Feature tile, capability rail, integration card.
**Grey Inset Card**
- Background: `#f5f5f5`. Border: none. Radius: `8px`. Padding: `32px`.
- Use: Testimonial block, code-tour container, quoted callout.
### Badges, Tags, Pills
**Eyebrow Label** — no chrome, just type. ABC Favorit Mono 500 / 12px / uppercase / 0.08em tracking, colour `#5b5b5b`. Sits above section headlines.
**Status Pill (Green)** — bg `#e8faf0`, text `#0a8f4f`, radius `4px`, padding `4px 10px`. Active / live / online status.
**Status Pill (Neutral)** — bg `#f5f5f5`, text `#1a1a1a`, radius `4px`, padding `4px 10px`. Default / inactive status.
### Inputs / Forms
- Background: `#ffffff`. Border: `1px solid rgba(0, 0, 0, 0.16)`. Radius: `6px`. Padding: `12px 14px`.
- Font: ABC Favorit 400 / 16px. Placeholder: `#8a8a8a`.
- Focus: `0 0 0 2px #1ad379` green ring, border → `#000000`.
- Error: border → `#a82020`, ring → `rgba(168, 32, 32, 0.30)`.
- Helper: caption 13px slate-soft below.
### Navigation
- Header height `64px`. Background `#ffffff` (becomes `rgba(255,255,255,0.85)` blur on scroll).
- Logo: Plain wordmark, pure black, no decorative mark.
- Nav links: ABC Favorit 500 / 14px, colour `#000000`, padding `8px 12px`. Hover → `#1ad379` green.
- Right-side CTA: ghost "SIGN IN" + primary green pill rect "BOOK A DEMO". Both all-caps, both ABC Favorit 700.
- Mobile: full-screen sheet, links stack at 28px / ABC Favorit 500 (sentence case for legibility on mobile).
### Optional Components
**Pull Quote** — ABC Favorit 28px / 400 / -0.01em tracking, near-black `#1a1a1a` text, with a 4px green vertical rule on the left edge.
**Footnote** — ABC Favorit 13px / 400, slate-soft; sits on a thin border-subtle rule.
**Code Block** — ABC Favorit Mono 14px, bg `#f5f5f5` light grey, radius `8px`, padding `16px 20px`, no border (the grey fill is the separation). Inline code: same font, bg `rgba(0, 0, 0, 0.06)`, padding `2px 6px`, radius `4px`. Syntax highlighting uses muted black + green + warm-amber tokens.
**Tooltip** — bg `#000000`, text `#ffffff`, radius `4px`, padding `8px 12px`, font `13px / ABC Favorit 500`.
**Modal** — bg `#ffffff`, radius `12px`, shadow `rgba(0, 0, 0, 0.10) 0 16px 40px -16px`, max-width `560px`. Black backdrop overlay at 50% opacity.
## 5. Layout Principles
### Spacing System
- **Base unit**: 4px.
- **Scale**: 4, 8, 12, 16, 24, 32, 48, 64, 96, 128, 160 — Fibonacci-adjacent.
- **Density observation**: Plain is *generously spaced*. There is more whitespace than content above the fold, and that ratio is preserved as the user scrolls. Headlines float in 96–128px of margin; body paragraphs sit on 24px line gaps.
### Grid & Container
- **Page max width**: `1200px` — narrower than Mintlify's 1280, signalling content-density restraint.
- **Site gutter**: `clamp(24px, 5vw, 64px)`.
- **Grid**: 12 columns with 24px gutters. Hero blocks span full width; capability rails span 4 columns; sidebars span 3.
- **Hero treatment**: full-bleed white, 80px headline anchored left, single all-caps green CTA below.
### Whitespace Philosophy
The page breathes — there is more whitespace than content above the fold, and that ratio is preserved as the user scrolls. Section gutters run **96–128px** between major editorial blocks; minor blocks sit on 64–80px gaps; intra-section spacing uses 24–48px. The deliberate emptiness reinforces the brand's "respect your attention" pitch.
### Section Cadence
- Hero (white, 80px hero) → Capability Rail (white card grid, hairline borders) → Code-Tour Block (`#f5f5f5` inset with mono code) → Testimonials (`#f5f5f5` inset with pull-quotes) → Pricing (white card grid, green emphasis on featured tier) → Footer (white ground, slate-soft micro-text).
- The grey inset blocks alternate with white, providing tonal rhythm without breaking into dark bands or color zones.
- White-on-white sections separated by 1px border-subtle hairlines or by spacing alone.
## 6. Shapes & Radius Scale
| Tier | Value | Use |
|---|---|---|
| Micro | 2px | Decorative dividers, inline chip corners |
| Standard (sm) | 6px | Buttons, inputs, dropdowns — the dominant `--radius--button` |
| Comfortable (md) | 6px | Same as sm — Plain doesn't differentiate |
| Relaxed (lg) | 8px | Cards, code blocks |
| Featured (xl) | 12px | Modals, popovers |
| Pill | 9999px | Reserved for status chips and the rare badge |
Plain's signature shape is the **6px button** — distinctly *not* a pill. The system favours soft-rectangle over pill, distinguishing it from Linear's keyboard-chip aesthetic and the Vercel/Mintlify pill convention. There is no `0px` sharp-edge except section dividers. Cards run 8px. The pill (9999px) is reserved for status chips and the rare badge — never the primary action.
## 7. Depth & Elevation
| Level | Treatment | Use |
|---|---|---|
| 0 | Flat — no shadow | Default page surface, hero, body sections |
| 1 | Surface tier (`#f5f5f5` on white) | Inset cards, code blocks |
| 2 | Hairline border (`rgba(0, 0, 0, 0.08)`) | Default cards |
| 3 | `rgba(0, 0, 0, 0.06) 0 4px 12px` | Hover-lifted cards (rare) |
| 4 | `rgba(0, 0, 0, 0.08) 0 12px 32px -8px` | Overlay menus, popovers |
| 5 | `rgba(0, 0, 0, 0.10) 0 16px 40px -16px` | Modals |
### Shadow Philosophy
Plain's depth language is **completely flat**. Cards lift off white by hairline border alone (`rgba(0, 0, 0, 0.08)`); inset blocks lift by switching to the `#f5f5f5` surface tier. There are no shadows on cards. The only "elevation" event on the page is the green CTA, and it elevates by colour, not by shadow. When shadows do appear (modals, popovers), they're tinted with low-opacity black, never blue-tinted. The brand reads as paper-flat — the same reason heavy drop-shadows would feel wrong: Plain's pitch is "we don't add what you don't need," and a layered hero would betray it.
## 8. Interaction & Motion
### Easing Curves
- `ease-standard`: `cubic-bezier(0.4, 0, 0.2, 1)` — Material-style; default for hover, focus, color transitions.
- `ease-emphasized`: `cubic-bezier(0.2, 0, 0, 1)` — punchier exit; modal enter, hero reveal.
- `ease-out`: `cubic-bezier(0.0, 0, 0.2, 1)` — gentle settle; dropdown reveal.
### Duration Buckets
- **Fast (100ms)** — colour transitions, focus rings, link hovers.
- **Standard (180ms)** — button hover, card hover, dropdown reveal.
- **Slow (300ms)** — modal enter/exit, page section fade-in.
- **Page (400ms)** — route transitions, hero reveal sequences.
### Per-Component Micro-States
- **Button hover (green)**: bg `#1ad379` → `#0fb866`; transition `180ms ease-standard`. No lift, no scale, no shadow.
- **Button hover (outlined)**: bg transparent → `rgba(0, 0, 0, 0.04)`.
- **Card hover**: border deepens from `rgba(0, 0, 0, 0.08)` to `rgba(0, 0, 0, 0.16)`; no shadow change.
- **Link hover**: colour `#000000` → `#1ad379` over 100ms. Underline thickness stays at 1px.
- **Input focus**: 2px green ring fades in over 100ms; border darkens to pure black.
### Page Transitions
Hero text fades in over 400ms with 16px translate-up; below-fold sections use `IntersectionObserver` to fade in at 80% viewport, 300ms duration, no translate. The brand does not use scroll-pinned animations.
### Reduced Motion
`@media (prefers-reduced-motion: reduce)` — all transitions become opacity-only, durations halved. Translate animations are disabled entirely; scroll-linked reveals snap to final state.
## 9. Accessibility & A11y
### Contrast Pairs
- **`#000000` text on `#ffffff` bg**: 21.0:1 — AAA at all sizes (theoretical maximum).
- **`#5b5b5b` text on `#ffffff` bg**: 7.4:1 — AAA at body sizes.
- **`#8a8a8a` text on `#ffffff` bg**: 4.5:1 — AA at large sizes only (≥18px or ≥14px bold).
- **`#000000` text on `#1ad379` button**: 9.5:1 — AAA at body sizes; safe for buttons.
- **`#0a8f4f` text on `#e8faf0` chip**: 6.8:1 — AAA.
The black-on-radioactive-green CTA is unusual but contrast-safe — most green CTAs in SaaS use white text, which on `#1ad379` would be only 2.4:1 (failing AA). Plain's choice of black-on-green is *both* the brand signature and the accessibility-correct decision.
### Focus Indicators
- Default focus ring: `0 0 0 2px #1ad379` green with 2px offset on white pages.
- On dark surfaces (rare): `0 0 0 2px #ffffff`.
- All interactive surfaces must have a visible focus state — no `outline: none` without a replacement.
### ARIA Patterns
- **Navigation**: `<nav aria-label="Main">` with skip-link to main content.
- **Disclosure**: `<button aria-expanded aria-controls>` for collapsible sections.
- **Dialog**: `role="dialog" aria-modal="true" aria-labelledby` with focus trap and Esc-to-close.
- **Combobox**: `role="combobox" aria-expanded aria-autocomplete="list"` for any inline search/select.
- **Live regions**: `aria-live="polite"` for form validation messages.
### Keyboard Navigation
- Tab order matches visual flow: skip-link → nav → hero CTA → main content → footer.
- All buttons, links, inputs reachable via Tab; modals trap focus inside until dismissed.
- `Esc` closes modals and the mobile menu sheet.
- Arrow keys navigate within tab groups.
### Screen Reader Hints
- All-caps button copy is set with `text-transform: uppercase` (CSS), not capital letters in markup, so screen readers announce the natural-case word ("Book a demo" not "B-O-O-K-A-D-E-M-O").
- Icon-only buttons have `aria-label`.
- The Plain wordmark uses `aria-label="Plain"`.
### Reduced Motion
Honoured via the global media query. All translate/scale animations become opacity-only; durations halve.
## 10. Responsive Behavior
### Breakpoints
| Name | Width | Use |
|---|---|---|
| Mobile | < 640px | Single column, full-bleed sections, 40px H1 |
| Tablet | 640–1024px | 2-column rails, 56px H1 |
| Desktop | 1024–1200px | Full 12-col grid, 80px hero, 680px prose |
| Wide | 1200–1440px | Site max width hits |
| Ultra | > 1440px | Page locks to 1200, gutters expand |
### Touch Targets
- Minimum tap target: 44×44px (WCAG AAA).
- Buttons: 48px minimum height on mobile (14px vertical padding × 2 + line-height).
- Nav link tap area: 44×44px even when visual padding is smaller.
### Collapsing Strategy
- **Header**: full nav at ≥1024px; hamburger sheet below.
- **Hero**: 96px display → 80px hero → 64px → 48px → 40px across breakpoints.
- **Capability grid**: 4-up at desktop, 2-up at tablet, 1-up at mobile.
- **Body width**: 680px → fluid 90vw at mobile.
- **Section spacing**: 128px → 96px → 64px across sizes.
- **All-caps CTA**: maintains uppercase + 0.06em tracking on mobile (font size scales down to 12px to compensate).
### Image Behavior
- Capability illustrations use `srcset` with 1x/2x/3x.
- Browser-screenshot imagery uses `aspect-ratio` to prevent layout shift.
- Lazy-loading on below-fold images; eager on hero.
### Container Queries
Used inside capability cards to switch icon position when card width crosses 280px (icon-left vs. icon-top).
## 11. Content & Voice
### Tone
**Restrained, technical, deliberately confident.** Plain writes like a product team that has decided their value proposition is "fewer features, deeper craft." Headlines pose plain claims ("Build support your way"); subheads explain what the product does without selling around it; product copy uses developer vocabulary ("API," "webhooks," "integrations") without code-bro hostility. The voice is the inverse of Intercom's friendly-cute register.
### Microcopy Patterns
- **Button verbs (all-caps)**: "BOOK A DEMO," "GET STARTED," "CONTACT SALES," "WATCH THE DEMO," "READ THE DOCS." The all-caps register is reserved for primary CTAs only.
- **Button verbs (sentence case, ghost)**: "Sign in," "Learn more," "View pricing." Used for nav and quiet third actions.
- **Error messages**: "We couldn't reach the API. Check your connection and try again." Specific, calm, no shame.
- **Success confirmations**: "Saved." "Thanks — we'll be in touch within a day." Brief, accountable.
- **Loading states**: "Loading…" "Connecting…" — context-specific where possible.
### Empty States
What they say: explain the state and offer the next step. *"No conversations yet. Connect a Slack workspace or import from your existing tool to get started."*
What they don't say: "Oops!", "Whoops!", any apologetic exclamation. Empty states are normal, not failures.
### CTA Verb Conventions
- Primary on hero: "BOOK A DEMO," "GET STARTED," "CONTACT SALES"
- Secondary: "WATCH THE DEMO," "READ THE DOCS"
- Footer: "Read our blog," "Browse changelog," "View pricing," "Contact us"
The all-caps register is the brand's deliberate B2B-enterprise signal; it sets Plain apart from Notion/Linear/Vercel's sentence-case register. Plain doesn't trade on consumer-friendly approachability — it trades on enterprise-developer credibility.
## 12. Dark Mode & Theming
**Light-only — no dark variant offered on the marketing surface.** Plain's white canvas, black text, and radioactive green are calibrated for white only — the green `#1ad379` would clip and look neon on a dark canvas, and the brand's black-on-green inversion only works against a high-contrast light background. A dark mode would require re-keying the entire palette, and the current chromatic discipline (pure white + black + one green) is the brand's defining choice.
The product UI (Plain's customer-support workspace) handles its own theming separately and does ship a dark variant for in-product use; that variant is documented at the product layer, not on the marketing surface. The marketing site at `plain.com` is intentionally light-only across all viewports and times of day.
If a downstream surface ever needs a dark companion, the rule would be: keep the green at full saturation, swap white for `#0f0f0f` (warm-deep), lift cards to `#1a1a1a`, and shift on-brand text from black to white for the dark canvas — but this is not currently shipped.
## 13. Lineage & Influences
Plain's design DNA is **Linear-restraint applied to customer-support tooling**. The white-canvas, single-accent, type-led layout quotes Linear's marketing chrome directly, then ports it from dark to light and from indigo to radioactive green. Where Linear runs near-black canvas + Inter Variable + indigo accent, Plain runs pure white + ABC Favorit + lime-green — same vocabulary, different polarity, same audience.
What it inherits: Linear's restrained-sans-plus-single-accent vocabulary, Linear's weight-400 headlines (rare in SaaS), Linear's "minimalism as proof of product confidence" pitch. What it borrows from contemporaries: Vercel's white-canvas SaaS-sibling register, Cal.com's "the modern reference for type does the work, no illustration" template, Stripe's hairline-border restraint. What it rejects: the Intercom-style colorful-illustrated-cute register that dominates the support-tool category — which is the entire visual differentiation pitch.
**Named influences:**
- **Dinamo Typefaces (ABC Favorit)** — The grotesk on the entire site; a design-conscious type choice that signals craft to the Linear-influenced audience. *https://abcdinamo.com/typefaces/favorit*
- **Linear** — Restrained-sans-plus-single-accent vocabulary; weight-400 headlines; minimalism as proof of product confidence. *https://linear.app*
- **Vercel** — White-canvas SaaS sibling; the modern reference for "type does the work, no illustration." *https://vercel.com*
- **Cal.com** — Adjacent precedent for design-conscious B2B SaaS with single-accent discipline. *https://cal.com*
- **Intercom** — Direct competitor; Plain positions itself as the cleaner, more developer-shaped alternative. The visual differentiation is the entire pitch. *https://intercom.com*
- **Stripe** — Hairline-border restraint, single-accent confidence on a neutral canvas. *https://stripe.com*
- **The Plain in-house brand team** — Discipline of weight 400 at 80px, all-caps CTA register, single-family commitment.
## 14. Do's and Don'ts
### Do
- **Do** commit to a single licensed grotesk for the entire surface. ABC Favorit (or Söhne, or Söhne Mono) on every element is the move; mixing families breaks the discipline.
- **Do** treat the brand color as a single radioactive event. One CTA, one brand wordmark — that's the whole chromatic budget.
- **Do** scale the headline aggressively (80px+) at weight 400. The type carries it; weight 600/700 at that size would feel shouty.
- **Do** use all-caps + 700 + `0.06em` letter-spacing for primary CTA copy. The "BOOK A DEMO" register is the brand's enterprise-B2B signal.
- **Do** keep black text on the green button. White-on-green would fail contrast and break the Linear-keyboard-chip aesthetic.
- **Do** use 6px button radius — not the SaaS-pill convention. The soft-rectangle shape is part of the brand.
- **Do** use the `#f5f5f5` surface tier for inset blocks. It's the only secondary surface — keep it disciplined.
- **Do** ship hairline borders at 8% black for cards. No shadow, no warm-neutral fill — flat is the depth language.
- **Do** use sentence case for non-CTA copy (nav, body, captions). Reserve all-caps for the CTA register only.
- **Do** prefer flat depth (hairline borders, surface tier swaps) over layered elevation.
### Don't
- **Don't** add gradients or hero illustrations. Plain's restraint is the differentiator.
- **Don't** use system Inter as a Favorit substitute — the humanist details (the curved lowercase `g`, the angled stroke endings) are what make the page feel licensed and specific.
- **Don't** introduce a second accent color. The green is the budget; info uses cool-grey, not blue.
- **Don't** spread the green to backgrounds or non-action emphasis. Reserve it for the CTA fill, brand wordmark, and success bg.
- **Don't** drop the all-caps + `0.06em` tracking from CTAs. Going to sentence-case erases the enterprise-B2B differentiation.
- **Don't** use a pill (9999px) on action buttons. The 6px soft-rectangle is the brand shape.
- **Don't** apply heavy drop-shadows. Plain's depth language is hairline borders and surface tier swaps.
- **Don't** ship a warm-neutral or cream canvas. Pure white `#ffffff` is the entry ticket.
- **Don't** introduce a serif or a second sans. The Favorit ecosystem is the system.
- **Don't** crowd the page. The whitespace ratio is part of the brand.
## 15. Agent Prompt Guide
### Quick Color Reference
```
bg: #ffffff
bg-secondary: #f5f5f5
text: #000000
text-soft: #5b5b5b
brand-green: #1ad379
brand-green-hover: #0fb866
on-brand: #000000 (black on green is the signature)
cta-bg: #1ad379
cta-text: #000000
border: rgba(0, 0, 0, 0.08)
border-strong: rgba(0, 0, 0, 0.16)
```
### Example Component Prompts
1. **"Create a hero in Plain style — pure white `#ffffff` canvas, 80px headline in ABC Favorit weight 400 with `-0.02em` tracking, 20px Favorit body in pure black, single primary CTA in radioactive green `#1ad379` with all-caps black label `'BOOK A DEMO'` (Favorit 700 / 13px / `0.06em` tracking), 6px radius, no gradient, no animation. Reading column capped at 680px."**
2. **"Design a capability card in Plain style — white `#ffffff` background, 8px radius, 1px `rgba(0, 0, 0, 0.08)` hairline border, 24px interior padding, 22px ABC Favorit 500 heading, 16px Favorit 400 body in pure black, no shadow, hover deepens border to 0.16 opacity."**
3. **"Build an inset code-tour block — `#f5f5f5` light-grey background, 8px radius, no border, 32px interior padding, ABC Favorit Mono code at 14px in pure black, single mono caption above at 12px / 0.08em / `#5b5b5b`."**
4. **"Compose a pricing card with featured tier — white background, 8px radius, hairline border. Featured tier replaces border with green `#1ad379` 2px outline + green `BOOK A DEMO` button at the bottom. Other tiers use outlined secondary buttons (transparent + 1px black 0.16 border, all-caps copy)."**
5. **"Render an eyebrow + section header pair — ABC Favorit Mono caps at 12px / `0.08em` tracking / `#5b5b5b`, 8px gap, then ABC Favorit 48px / 400 / `-0.015em` in pure black on white."**
6. **"Create the primary nav — 64px header height, white `#ffffff` background (becomes white-blur on scroll), Plain wordmark in pure black, links 14px Favorit 500 (sentence case) with green-on-hover, right-aligned ghost 'Sign in' + green pill rect 'BOOK A DEMO' (all-caps, 6px radius, black label) pair."**
### Iteration Guide
1. **Start with pure white, not warm.** If the bg is `#fafafa` or warmer, you've drifted toward Mintlify territory. `#ffffff` is the entry ticket.
2. **Switch to ABC Favorit at weight 400.** Inter or system-ui at the same size collapses the brand into Vercel/Mintlify territory. The Dinamo grotesk is the differentiator.
3. **Push the headline to 80px.** Plain's confidence signal is large size at light weight — 48–64px reads as Vercel/Mintlify; 80px+ at weight 400 reads as Plain.
4. **Switch the CTA to all-caps.** "Book a Demo" → "BOOK A DEMO" with `0.06em` tracking, weight 700, 13px. The register flip is the enterprise-B2B signal.
5. **Use black text on the green button.** White-on-green is the SaaS default; black-on-green is the Plain-specific inversion that looks like a Linear keyboard chip.
6. **Strip everything else.** Remove gradients, illustrations, mascots, second accent colours, drop-shadows, off-white surfaces. The minimalism is the brand.
7. **Drop the shadows; tier the surface.** Replace box-shadows with `#f5f5f5` inset blocks or hairline borders.
8. **Calm the verbs in non-CTA copy, but keep CTAs all-caps.** "Learn more" stays sentence case; "READ THE DOCS" goes all-caps. The register split is part of the system.
1. Visual Theme & Atmosphere
Plain runs the Linear playbook on a white canvas. The headline “Build support your way” is set in ABC Favorit (a Dinamo Typefaces grotesk) at 80px / weight 400 with -0.02em tracking — the same kind of typographic confidence Linear shows on its dark canvas, ported into B2B support software. The single chromatic event on the page is the lime-green #1ad379 CTA — radioactive enough to stop the eye, restrained enough that nothing else competes with it. The “BOOK A DEMO” label sits in all-caps, weight 700, with 0.06em letter-spacing — a deliberate enterprise-B2B register that reads more like a band poster than a SaaS marketing button.
What makes Plain distinctive is the category positioning. The customer-support tool category is dominated by Intercom-style colorful, illustrated, slightly cute pages: cartoon avatars, gradient hero sections, mascot illustrations, multiple brand colors. Plain refuses the entire vocabulary. The “BOOK A DEMO” button is set in all-caps on a radioactive green that looks more like a Linear keyboard chip than a SaaS button. Combined with the Dinamo-licensed grotesk, the page reads as deeply intentional — the kind of restraint that signals to engineering buyers that the product itself will respect their attention. Plain is targeting Linear customers and similar developer-shaped support buyers, and the marketing chrome is a self-selection filter.
The third register is the discipline of weight 400 at 80px. Most type-confident SaaS sites lean on weight 600 or 700 for hero copy — that’s the Vercel/Mintlify/Linear convention. Plain pushes the headline to 80px (genuinely large, larger than Linear or Vercel’s 48–64px hero) but keeps it at weight 400. The choice is the type’s confidence signal: ABC Favorit has enough character — humanist proportions, the curved lowercase g, the angled stroke endings — to hold the page without leaning on weight. Going to 600 or 700 at 80px would feel shouty; staying at 400 reads as “the form alone is enough.”
Atmospheric vocabulary that captures the feeling: radioactive-green, all-caps-CTA, Dinamo-licensed, weight-400-confident, white-canvas-restraint, Linear-cousin, Intercom-rejection, support-for-engineers, type-does-the-work, no-illustration, single-accent-budget. Every surface lands like it was designed by an engineering-design partnership that has read their Brian Eno and decided that subtraction is the move.
Key Characteristics
- Pure white
#ffffffcanvas — no warm tint, no off-white, no cream - Custom ABC Favorit by Dinamo — humanist grotesk on the entire surface
- Single radioactive-green
#1ad379accent — the whole chromatic budget - All-caps, weight-700,
0.06emletter-spacing CTAs — band-poster register - Black text on green button — the signature inversion (most green CTAs use white text)
- Headline at 80px weight 400 — type confidence signal
- Two-tier surface (white +
#f5f5f5) — minimal palette - 6px button radius — smaller than the SaaS-pill convention
- ABC Favorit Mono cousin — code blocks share the parent family proportions
- 96–128px section gutters — generous, Linear-paced spacing
- No gradients, no illustrations, no mascots — pure type + accent + restraint
- Single-family discipline — display, body, mono all from the Favorit ecosystem
2. Color Palette & Roles
Primary
- bg
#ffffff— pure white canvas. No warm tint, no off-white, no cream. - text
#000000— pure black for headlines and body. Maximum contrast at 21:1. - bg-secondary
#f5f5f5— the only secondary surface tier. Used for code blocks, inset testimonials, quoted callouts. - bg-tertiary
#fafafa— subtle hover ground for nav, list rows. - on-brand
#000000— black label on green CTA. The signature inversion — most green CTAs in SaaS use white text; Plain’s black text on radioactive green is what makes the button look like a Linear keyboard chip.
Brand & Accent
- brand
#1ad379— radioactive lime-green CTA. The whole chromatic budget. Reserved for the primary action and the brand wordmark; never spread to backgrounds, never used for non-action emphasis. - brand-hover
#0fb866— deeper green for hover state. - brand-deep
#0a8f4f— pressed-state and “success-text” colour. - brand-soft
#e8faf0— green wash for success backgrounds. - brand-tint
#b8f0d2— green tint for status chips.
Interactive
- link
#000000— body links default to black, underlined. Plain trusts that black-with-underline reads as a link. - link-hover
#1ad379— green on hover; the only chromatic transition. - selected-bg
#f5f5f5— selected nav state. - disabled
#b8b8b8— disabled control text.
Neutral Scale
- black
#000000— primary text and headlines. - near-black
#1a1a1a— secondary heading colour. - slate-soft
#5b5b5b— captions, metadata. - slate-faint
#8a8a8a— eyebrows, helper text, placeholder. - slate-muted
#b8b8b8— disabled microcopy.
The choice to use fixed hex values (rather than opacity-based scales like Mintlify) is deliberate: Plain is high-contrast-only, and the fixed neutrals never become ambiguous against tinted surfaces.
Surface & Borders
- surface-0 (page)
#ffffffpure white. - surface-1 (panel)
#f5f5f5light grey. - surface-2 (subtle)
#fafafavery light grey. - border
rgba(0, 0, 0, 0.08)— default hairline. - border-strong
rgba(0, 0, 0, 0.16)— outlined buttons. - border-subtle
rgba(0, 0, 0, 0.04)— quietest separation. - border-brand
rgba(26, 211, 121, 0.30)— green-tinted rule for brand emphasis.
Shadow Colors
Plain uses almost no shadows. The two-tier surface system (white + #f5f5f5) provides all the depth — there are no shadows on cards, no drop-shadow on the hero, nothing that mimics a layered UI. The only “elevation” event on the page is the green CTA, and it elevates by colour, not by shadow. When shadows do appear (modals, popovers), they’re tinted with low-opacity black at 6–10%, never blue-tinted. The brand reads as completely flat.
Semantic
- success — bg
#e8faf0(green wash), text#0a8f4f(deep green), borderrgba(26, 211, 121, 0.30). Note: success uses the brand green — single-accent discipline maintained. - warning — bg
#fff4e0(warm-amber wash), text#7a4a00, borderrgba(122, 74, 0, 0.25). - danger — bg
#fde6e6(soft-red wash), text#a82020, borderrgba(168, 32, 32, 0.30). - info — bg
#eef2f7(cool-grey wash), text#1a1a1anear-black. Note: info reads as quiet (grey), not blue — Plain rejects the info-blue convention because blue would be a second brand color.
3. Typography Rules
Font Family
- Display & Body:
"ABC Favorit", "ABC Favorit Regular", -apple-system, system-ui, sans-serif— Dinamo Typefaces’ humanist grotesk. Used at 400 / 500 / 700. The defining type choice. - Mono:
"ABC Favorit Mono", ui-monospace, "SF Mono", monospace— the matched monospace cousin from the same Favorit ecosystem. Shares the parent family’s proportions, keeping page texture consistent. - OpenType features:
ligaandkernalways on.tnumandzeroenabled in mono for code tabular alignment. - The “ABC Favorit Regular” placeholder is loaded as a fallback during font swap, signalling careful FOUT/FOIT engineering — a brand discipline tell for design-conscious developer buyers.
Hierarchy
| Role | Font | Size | Weight | Line Height | Letter Spacing | OT Features | Notes |
|---|---|---|---|---|---|---|---|
| Display Hero | ABC Favorit | 96px | 400 | 0.92 | -0.025em | liga | Largest hero variant |
| Display | ABC Favorit | 80px | 400 | 0.95 | -0.02em | liga | The canonical Plain hero |
| H1 | ABC Favorit | 64px | 400 | 1.00 | -0.02em | liga | Page title |
| H2 | ABC Favorit | 48px | 400 | 1.05 | -0.015em | liga | Major section |
| H3 | ABC Favorit | 32px | 500 | 1.15 | -0.01em | — | Sub-section, weight steps to 500 |
| H4 | ABC Favorit | 22px | 500 | 1.25 | normal | — | Card heading |
| H5 | ABC Favorit | 18px | 500 | 1.35 | normal | — | Inline emphasis |
| Eyebrow | ABC Favorit Mono | 12px | 500 | 1.40 | 0.08em | uppercase | Section pre-label |
| Body Large | ABC Favorit | 20px | 400 | 1.50 | normal | — | Lede paragraph |
| Body | ABC Favorit | 16px | 400 | 1.50 | normal | — | Default paragraph copy |
| Body Small | ABC Favorit | 14px | 400 | 1.50 | normal | — | Captions, sidebars |
| Caption | ABC Favorit | 13px | 400 | 1.40 | normal | — | Image captions |
| Caption Tabular | ABC Favorit Mono | 12px | 500 | 1.40 | normal | tnum | Stats, data labels |
| Label | ABC Favorit Mono | 11px | 500 | 1.30 | uppercase | — | UI labels, mono caps |
| Button | ABC Favorit | 13px | 700 | 1.00 | 0.06em | uppercase | The all-caps CTA register |
| Pull Quote | ABC Favorit | 28px | 400 | 1.25 | -0.01em | — | Editorial pull-quote |
| Code | ABC Favorit Mono | 14px | 400 | 1.55 | normal | — | Inline + block |
| Code Micro | ABC Favorit Mono | 11px | 400 | 1.40 | normal | — | Footnote refs |
Principles
- Weight 400 at 80px is the brand’s confidence signal. ABC Favorit at 80px / 400 /
-0.02emis the canonical Plain hero. Going to 600 or 700 at that size would feel shouty; 400 lets the form do the work. - Single-family discipline. ABC Favorit and ABC Favorit Mono cover display, body, navigation, captions, code, eyebrows. Adding a serif or a second sans breaks the system entirely.
- All-caps + 700 +
0.06emfor CTA copy only. The “BOOK A DEMO” / “GET STARTED” register is reserved for primary action labels; body copy never goes all-caps. - Negative tracking compresses with size.
-0.025emat 96px,-0.02emat 64–80px,-0.015emat 48px,-0.01emat 28–32px, normal at 22px and below. - Hierarchy by size and color, not weight. Body and headlines both default to 400; H3 steps to 500 only when the size doesn’t carry enough difference.
- Mono for eyebrows, not just code. ABC Favorit Mono caps at 12px /
0.08emtracking are Plain’s section pre-labels — a Dinamo-signed signal of type discipline. - No italic in display. Headlines never italicise. Body italics carry quoted titles only.
- Self-hosted Favorit Variable. The “ABC Favorit Regular” fallback shim is an engineering signal — Dinamo-licensed type, FOUT-prevented, served by the brand directly.
4. Component Stylings
Buttons
Primary (Radioactive Green)
- Background:
#1ad379. Text:#000000, ABC Favorit 700 / 13px / uppercase /0.06emtracking. - Padding:
14px 24px. Radius:6px— distinctly not a pill. Plain’s CTA shape is a soft rectangle, distinguishing it from Linear’s pill chips. - Hover: bg →
#0fb866(deeper green); transition180ms ease-standard. No lift, no scale. - Active: bg →
#0a8f4f. - Use: Primary CTA — BOOK A DEMO, GET STARTED, CONTACT SALES. The whole brand budget — this is the only place radioactive green appears as a fill.
Secondary (Outlined)
- Background: transparent. Text:
#000000. Border:1px solid rgba(0, 0, 0, 0.16). Radius:6px. - Same padding (14×24), font (ABC Favorit 700 / 13px / uppercase / 0.06em).
- Hover: bg →
rgba(0, 0, 0, 0.04). - Use: Twin to primary — WATCH THE DEMO, READ THE DOCS. All-caps maintained.
Black (Alternate Primary)
- Background:
#000000. Text:#ffffff. No border. 6px radius. - Same shape and font as primary.
- Hover: bg →
#1a1a1a. - Use: Alternate primary on pages where the green is already used elsewhere (e.g. green logo lockup, green status indicator). Rare.
Ghost (Quiet)
- Background: transparent. Text:
#000000. No border. - Padding:
8px 12px. ABC Favorit 500 / 14px (sentence case, not uppercase). - Hover: text →
#1ad379green. - Use: Nav links, footer secondary actions.
Cards
Default Card (Flat)
- Background:
#ffffff. Border:1px solid rgba(0, 0, 0, 0.08). Radius:8px. Padding:24px. - Shadow: none.
- Hover: border →
rgba(0, 0, 0, 0.16); transition180ms. - Use: Feature tile, capability rail, integration card.
Grey Inset Card
- Background:
#f5f5f5. Border: none. Radius:8px. Padding:32px. - Use: Testimonial block, code-tour container, quoted callout.
Badges, Tags, Pills
Eyebrow Label — no chrome, just type. ABC Favorit Mono 500 / 12px / uppercase / 0.08em tracking, colour #5b5b5b. Sits above section headlines.
Status Pill (Green) — bg #e8faf0, text #0a8f4f, radius 4px, padding 4px 10px. Active / live / online status.
Status Pill (Neutral) — bg #f5f5f5, text #1a1a1a, radius 4px, padding 4px 10px. Default / inactive status.
Inputs / Forms
- Background:
#ffffff. Border:1px solid rgba(0, 0, 0, 0.16). Radius:6px. Padding:12px 14px. - Font: ABC Favorit 400 / 16px. Placeholder:
#8a8a8a. - Focus:
0 0 0 2px #1ad379green ring, border →#000000. - Error: border →
#a82020, ring →rgba(168, 32, 32, 0.30). - Helper: caption 13px slate-soft below.
Navigation
- Header height
64px. Background#ffffff(becomesrgba(255,255,255,0.85)blur on scroll). - Logo: Plain wordmark, pure black, no decorative mark.
- Nav links: ABC Favorit 500 / 14px, colour
#000000, padding8px 12px. Hover →#1ad379green. - Right-side CTA: ghost “SIGN IN” + primary green pill rect “BOOK A DEMO”. Both all-caps, both ABC Favorit 700.
- Mobile: full-screen sheet, links stack at 28px / ABC Favorit 500 (sentence case for legibility on mobile).
Optional Components
Pull Quote — ABC Favorit 28px / 400 / -0.01em tracking, near-black #1a1a1a text, with a 4px green vertical rule on the left edge.
Footnote — ABC Favorit 13px / 400, slate-soft; sits on a thin border-subtle rule.
Code Block — ABC Favorit Mono 14px, bg #f5f5f5 light grey, radius 8px, padding 16px 20px, no border (the grey fill is the separation). Inline code: same font, bg rgba(0, 0, 0, 0.06), padding 2px 6px, radius 4px. Syntax highlighting uses muted black + green + warm-amber tokens.
Tooltip — bg #000000, text #ffffff, radius 4px, padding 8px 12px, font 13px / ABC Favorit 500.
Modal — bg #ffffff, radius 12px, shadow rgba(0, 0, 0, 0.10) 0 16px 40px -16px, max-width 560px. Black backdrop overlay at 50% opacity.
5. Layout Principles
Spacing System
- Base unit: 4px.
- Scale: 4, 8, 12, 16, 24, 32, 48, 64, 96, 128, 160 — Fibonacci-adjacent.
- Density observation: Plain is generously spaced. There is more whitespace than content above the fold, and that ratio is preserved as the user scrolls. Headlines float in 96–128px of margin; body paragraphs sit on 24px line gaps.
Grid & Container
- Page max width:
1200px— narrower than Mintlify’s 1280, signalling content-density restraint. - Site gutter:
clamp(24px, 5vw, 64px). - Grid: 12 columns with 24px gutters. Hero blocks span full width; capability rails span 4 columns; sidebars span 3.
- Hero treatment: full-bleed white, 80px headline anchored left, single all-caps green CTA below.
Whitespace Philosophy
The page breathes — there is more whitespace than content above the fold, and that ratio is preserved as the user scrolls. Section gutters run 96–128px between major editorial blocks; minor blocks sit on 64–80px gaps; intra-section spacing uses 24–48px. The deliberate emptiness reinforces the brand’s “respect your attention” pitch.
Section Cadence
- Hero (white, 80px hero) → Capability Rail (white card grid, hairline borders) → Code-Tour Block (
#f5f5f5inset with mono code) → Testimonials (#f5f5f5inset with pull-quotes) → Pricing (white card grid, green emphasis on featured tier) → Footer (white ground, slate-soft micro-text). - The grey inset blocks alternate with white, providing tonal rhythm without breaking into dark bands or color zones.
- White-on-white sections separated by 1px border-subtle hairlines or by spacing alone.
6. Shapes & Radius Scale
| Tier | Value | Use |
|---|---|---|
| Micro | 2px | Decorative dividers, inline chip corners |
| Standard (sm) | 6px | Buttons, inputs, dropdowns — the dominant --radius--button |
| Comfortable (md) | 6px | Same as sm — Plain doesn’t differentiate |
| Relaxed (lg) | 8px | Cards, code blocks |
| Featured (xl) | 12px | Modals, popovers |
| Pill | 9999px | Reserved for status chips and the rare badge |
Plain’s signature shape is the 6px button — distinctly not a pill. The system favours soft-rectangle over pill, distinguishing it from Linear’s keyboard-chip aesthetic and the Vercel/Mintlify pill convention. There is no 0px sharp-edge except section dividers. Cards run 8px. The pill (9999px) is reserved for status chips and the rare badge — never the primary action.
7. Depth & Elevation
| Level | Treatment | Use |
|---|---|---|
| 0 | Flat — no shadow | Default page surface, hero, body sections |
| 1 | Surface tier (#f5f5f5 on white) | Inset cards, code blocks |
| 2 | Hairline border (rgba(0, 0, 0, 0.08)) | Default cards |
| 3 | rgba(0, 0, 0, 0.06) 0 4px 12px | Hover-lifted cards (rare) |
| 4 | rgba(0, 0, 0, 0.08) 0 12px 32px -8px | Overlay menus, popovers |
| 5 | rgba(0, 0, 0, 0.10) 0 16px 40px -16px | Modals |
Shadow Philosophy
Plain’s depth language is completely flat. Cards lift off white by hairline border alone (rgba(0, 0, 0, 0.08)); inset blocks lift by switching to the #f5f5f5 surface tier. There are no shadows on cards. The only “elevation” event on the page is the green CTA, and it elevates by colour, not by shadow. When shadows do appear (modals, popovers), they’re tinted with low-opacity black, never blue-tinted. The brand reads as paper-flat — the same reason heavy drop-shadows would feel wrong: Plain’s pitch is “we don’t add what you don’t need,” and a layered hero would betray it.
8. Interaction & Motion
Easing Curves
ease-standard:cubic-bezier(0.4, 0, 0.2, 1)— Material-style; default for hover, focus, color transitions.ease-emphasized:cubic-bezier(0.2, 0, 0, 1)— punchier exit; modal enter, hero reveal.ease-out:cubic-bezier(0.0, 0, 0.2, 1)— gentle settle; dropdown reveal.
Duration Buckets
- Fast (100ms) — colour transitions, focus rings, link hovers.
- Standard (180ms) — button hover, card hover, dropdown reveal.
- Slow (300ms) — modal enter/exit, page section fade-in.
- Page (400ms) — route transitions, hero reveal sequences.
Per-Component Micro-States
- Button hover (green): bg
#1ad379→#0fb866; transition180ms ease-standard. No lift, no scale, no shadow. - Button hover (outlined): bg transparent →
rgba(0, 0, 0, 0.04). - Card hover: border deepens from
rgba(0, 0, 0, 0.08)torgba(0, 0, 0, 0.16); no shadow change. - Link hover: colour
#000000→#1ad379over 100ms. Underline thickness stays at 1px. - Input focus: 2px green ring fades in over 100ms; border darkens to pure black.
Page Transitions
Hero text fades in over 400ms with 16px translate-up; below-fold sections use IntersectionObserver to fade in at 80% viewport, 300ms duration, no translate. The brand does not use scroll-pinned animations.
Reduced Motion
@media (prefers-reduced-motion: reduce) — all transitions become opacity-only, durations halved. Translate animations are disabled entirely; scroll-linked reveals snap to final state.
9. Accessibility & A11y
Contrast Pairs
#000000text on#ffffffbg: 21.0:1 — AAA at all sizes (theoretical maximum).#5b5b5btext on#ffffffbg: 7.4:1 — AAA at body sizes.#8a8a8atext on#ffffffbg: 4.5:1 — AA at large sizes only (≥18px or ≥14px bold).#000000text on#1ad379button: 9.5:1 — AAA at body sizes; safe for buttons.#0a8f4ftext on#e8faf0chip: 6.8:1 — AAA.
The black-on-radioactive-green CTA is unusual but contrast-safe — most green CTAs in SaaS use white text, which on #1ad379 would be only 2.4:1 (failing AA). Plain’s choice of black-on-green is both the brand signature and the accessibility-correct decision.
Focus Indicators
- Default focus ring:
0 0 0 2px #1ad379green with 2px offset on white pages. - On dark surfaces (rare):
0 0 0 2px #ffffff. - All interactive surfaces must have a visible focus state — no
outline: nonewithout a replacement.
ARIA Patterns
- Navigation:
<nav aria-label="Main">with skip-link to main content. - Disclosure:
<button aria-expanded aria-controls>for collapsible sections. - Dialog:
role="dialog" aria-modal="true" aria-labelledbywith focus trap and Esc-to-close. - Combobox:
role="combobox" aria-expanded aria-autocomplete="list"for any inline search/select. - Live regions:
aria-live="polite"for form validation messages.
Keyboard Navigation
- Tab order matches visual flow: skip-link → nav → hero CTA → main content → footer.
- All buttons, links, inputs reachable via Tab; modals trap focus inside until dismissed.
Esccloses modals and the mobile menu sheet.- Arrow keys navigate within tab groups.
Screen Reader Hints
- All-caps button copy is set with
text-transform: uppercase(CSS), not capital letters in markup, so screen readers announce the natural-case word (“Book a demo” not “B-O-O-K-A-D-E-M-O”). - Icon-only buttons have
aria-label. - The Plain wordmark uses
aria-label="Plain".
Reduced Motion
Honoured via the global media query. All translate/scale animations become opacity-only; durations halve.
10. Responsive Behavior
Breakpoints
| Name | Width | Use |
|---|---|---|
| Mobile | < 640px | Single column, full-bleed sections, 40px H1 |
| Tablet | 640–1024px | 2-column rails, 56px H1 |
| Desktop | 1024–1200px | Full 12-col grid, 80px hero, 680px prose |
| Wide | 1200–1440px | Site max width hits |
| Ultra | > 1440px | Page locks to 1200, gutters expand |
Touch Targets
- Minimum tap target: 44×44px (WCAG AAA).
- Buttons: 48px minimum height on mobile (14px vertical padding × 2 + line-height).
- Nav link tap area: 44×44px even when visual padding is smaller.
Collapsing Strategy
- Header: full nav at ≥1024px; hamburger sheet below.
- Hero: 96px display → 80px hero → 64px → 48px → 40px across breakpoints.
- Capability grid: 4-up at desktop, 2-up at tablet, 1-up at mobile.
- Body width: 680px → fluid 90vw at mobile.
- Section spacing: 128px → 96px → 64px across sizes.
- All-caps CTA: maintains uppercase + 0.06em tracking on mobile (font size scales down to 12px to compensate).
Image Behavior
- Capability illustrations use
srcsetwith 1x/2x/3x. - Browser-screenshot imagery uses
aspect-ratioto prevent layout shift. - Lazy-loading on below-fold images; eager on hero.
Container Queries
Used inside capability cards to switch icon position when card width crosses 280px (icon-left vs. icon-top).
11. Content & Voice
Tone
Restrained, technical, deliberately confident. Plain writes like a product team that has decided their value proposition is “fewer features, deeper craft.” Headlines pose plain claims (“Build support your way”); subheads explain what the product does without selling around it; product copy uses developer vocabulary (“API,” “webhooks,” “integrations”) without code-bro hostility. The voice is the inverse of Intercom’s friendly-cute register.
Microcopy Patterns
- Button verbs (all-caps): “BOOK A DEMO,” “GET STARTED,” “CONTACT SALES,” “WATCH THE DEMO,” “READ THE DOCS.” The all-caps register is reserved for primary CTAs only.
- Button verbs (sentence case, ghost): “Sign in,” “Learn more,” “View pricing.” Used for nav and quiet third actions.
- Error messages: “We couldn’t reach the API. Check your connection and try again.” Specific, calm, no shame.
- Success confirmations: “Saved.” “Thanks — we’ll be in touch within a day.” Brief, accountable.
- Loading states: “Loading…” “Connecting…” — context-specific where possible.
Empty States
What they say: explain the state and offer the next step. “No conversations yet. Connect a Slack workspace or import from your existing tool to get started.” What they don’t say: “Oops!”, “Whoops!”, any apologetic exclamation. Empty states are normal, not failures.
CTA Verb Conventions
- Primary on hero: “BOOK A DEMO,” “GET STARTED,” “CONTACT SALES”
- Secondary: “WATCH THE DEMO,” “READ THE DOCS”
- Footer: “Read our blog,” “Browse changelog,” “View pricing,” “Contact us”
The all-caps register is the brand’s deliberate B2B-enterprise signal; it sets Plain apart from Notion/Linear/Vercel’s sentence-case register. Plain doesn’t trade on consumer-friendly approachability — it trades on enterprise-developer credibility.
12. Dark Mode & Theming
Light-only — no dark variant offered on the marketing surface. Plain’s white canvas, black text, and radioactive green are calibrated for white only — the green #1ad379 would clip and look neon on a dark canvas, and the brand’s black-on-green inversion only works against a high-contrast light background. A dark mode would require re-keying the entire palette, and the current chromatic discipline (pure white + black + one green) is the brand’s defining choice.
The product UI (Plain’s customer-support workspace) handles its own theming separately and does ship a dark variant for in-product use; that variant is documented at the product layer, not on the marketing surface. The marketing site at plain.com is intentionally light-only across all viewports and times of day.
If a downstream surface ever needs a dark companion, the rule would be: keep the green at full saturation, swap white for #0f0f0f (warm-deep), lift cards to #1a1a1a, and shift on-brand text from black to white for the dark canvas — but this is not currently shipped.
13. Lineage & Influences
Plain’s design DNA is Linear-restraint applied to customer-support tooling. The white-canvas, single-accent, type-led layout quotes Linear’s marketing chrome directly, then ports it from dark to light and from indigo to radioactive green. Where Linear runs near-black canvas + Inter Variable + indigo accent, Plain runs pure white + ABC Favorit + lime-green — same vocabulary, different polarity, same audience.
What it inherits: Linear’s restrained-sans-plus-single-accent vocabulary, Linear’s weight-400 headlines (rare in SaaS), Linear’s “minimalism as proof of product confidence” pitch. What it borrows from contemporaries: Vercel’s white-canvas SaaS-sibling register, Cal.com’s “the modern reference for type does the work, no illustration” template, Stripe’s hairline-border restraint. What it rejects: the Intercom-style colorful-illustrated-cute register that dominates the support-tool category — which is the entire visual differentiation pitch.
Named influences:
- Dinamo Typefaces (ABC Favorit) — The grotesk on the entire site; a design-conscious type choice that signals craft to the Linear-influenced audience. https://abcdinamo.com/typefaces/favorit
- Linear — Restrained-sans-plus-single-accent vocabulary; weight-400 headlines; minimalism as proof of product confidence. https://linear.app
- Vercel — White-canvas SaaS sibling; the modern reference for “type does the work, no illustration.” https://vercel.com
- Cal.com — Adjacent precedent for design-conscious B2B SaaS with single-accent discipline. https://cal.com
- Intercom — Direct competitor; Plain positions itself as the cleaner, more developer-shaped alternative. The visual differentiation is the entire pitch. https://intercom.com
- Stripe — Hairline-border restraint, single-accent confidence on a neutral canvas. https://stripe.com
- The Plain in-house brand team — Discipline of weight 400 at 80px, all-caps CTA register, single-family commitment.
14. Do’s and Don’ts
Do
- Do commit to a single licensed grotesk for the entire surface. ABC Favorit (or Söhne, or Söhne Mono) on every element is the move; mixing families breaks the discipline.
- Do treat the brand color as a single radioactive event. One CTA, one brand wordmark — that’s the whole chromatic budget.
- Do scale the headline aggressively (80px+) at weight 400. The type carries it; weight 600/700 at that size would feel shouty.
- Do use all-caps + 700 +
0.06emletter-spacing for primary CTA copy. The “BOOK A DEMO” register is the brand’s enterprise-B2B signal. - Do keep black text on the green button. White-on-green would fail contrast and break the Linear-keyboard-chip aesthetic.
- Do use 6px button radius — not the SaaS-pill convention. The soft-rectangle shape is part of the brand.
- Do use the
#f5f5f5surface tier for inset blocks. It’s the only secondary surface — keep it disciplined. - Do ship hairline borders at 8% black for cards. No shadow, no warm-neutral fill — flat is the depth language.
- Do use sentence case for non-CTA copy (nav, body, captions). Reserve all-caps for the CTA register only.
- Do prefer flat depth (hairline borders, surface tier swaps) over layered elevation.
Don’t
- Don’t add gradients or hero illustrations. Plain’s restraint is the differentiator.
- Don’t use system Inter as a Favorit substitute — the humanist details (the curved lowercase
g, the angled stroke endings) are what make the page feel licensed and specific. - Don’t introduce a second accent color. The green is the budget; info uses cool-grey, not blue.
- Don’t spread the green to backgrounds or non-action emphasis. Reserve it for the CTA fill, brand wordmark, and success bg.
- Don’t drop the all-caps +
0.06emtracking from CTAs. Going to sentence-case erases the enterprise-B2B differentiation. - Don’t use a pill (9999px) on action buttons. The 6px soft-rectangle is the brand shape.
- Don’t apply heavy drop-shadows. Plain’s depth language is hairline borders and surface tier swaps.
- Don’t ship a warm-neutral or cream canvas. Pure white
#ffffffis the entry ticket. - Don’t introduce a serif or a second sans. The Favorit ecosystem is the system.
- Don’t crowd the page. The whitespace ratio is part of the brand.
15. Agent Prompt Guide
Quick Color Reference
bg: #ffffff
bg-secondary: #f5f5f5
text: #000000
text-soft: #5b5b5b
brand-green: #1ad379
brand-green-hover: #0fb866
on-brand: #000000 (black on green is the signature)
cta-bg: #1ad379
cta-text: #000000
border: rgba(0, 0, 0, 0.08)
border-strong: rgba(0, 0, 0, 0.16)Example Component Prompts
-
“Create a hero in Plain style — pure white
#ffffffcanvas, 80px headline in ABC Favorit weight 400 with-0.02emtracking, 20px Favorit body in pure black, single primary CTA in radioactive green#1ad379with all-caps black label'BOOK A DEMO'(Favorit 700 / 13px /0.06emtracking), 6px radius, no gradient, no animation. Reading column capped at 680px.” -
“Design a capability card in Plain style — white
#ffffffbackground, 8px radius, 1pxrgba(0, 0, 0, 0.08)hairline border, 24px interior padding, 22px ABC Favorit 500 heading, 16px Favorit 400 body in pure black, no shadow, hover deepens border to 0.16 opacity.” -
“Build an inset code-tour block —
#f5f5f5light-grey background, 8px radius, no border, 32px interior padding, ABC Favorit Mono code at 14px in pure black, single mono caption above at 12px / 0.08em /#5b5b5b.” -
“Compose a pricing card with featured tier — white background, 8px radius, hairline border. Featured tier replaces border with green
#1ad3792px outline + greenBOOK A DEMObutton at the bottom. Other tiers use outlined secondary buttons (transparent + 1px black 0.16 border, all-caps copy).” -
“Render an eyebrow + section header pair — ABC Favorit Mono caps at 12px /
0.08emtracking /#5b5b5b, 8px gap, then ABC Favorit 48px / 400 /-0.015emin pure black on white.” -
“Create the primary nav — 64px header height, white
#ffffffbackground (becomes white-blur on scroll), Plain wordmark in pure black, links 14px Favorit 500 (sentence case) with green-on-hover, right-aligned ghost ‘Sign in’ + green pill rect ‘BOOK A DEMO’ (all-caps, 6px radius, black label) pair.”
Iteration Guide
- Start with pure white, not warm. If the bg is
#fafafaor warmer, you’ve drifted toward Mintlify territory.#ffffffis the entry ticket. - Switch to ABC Favorit at weight 400. Inter or system-ui at the same size collapses the brand into Vercel/Mintlify territory. The Dinamo grotesk is the differentiator.
- Push the headline to 80px. Plain’s confidence signal is large size at light weight — 48–64px reads as Vercel/Mintlify; 80px+ at weight 400 reads as Plain.
- Switch the CTA to all-caps. “Book a Demo” → “BOOK A DEMO” with
0.06emtracking, weight 700, 13px. The register flip is the enterprise-B2B signal. - Use black text on the green button. White-on-green is the SaaS default; black-on-green is the Plain-specific inversion that looks like a Linear keyboard chip.
- Strip everything else. Remove gradients, illustrations, mascots, second accent colours, drop-shadows, off-white surfaces. The minimalism is the brand.
- Drop the shadows; tier the surface. Replace box-shadows with
#f5f5f5inset blocks or hairline borders. - Calm the verbs in non-CTA copy, but keep CTAs all-caps. “Learn more” stays sentence case; “READ THE DOCS” goes all-caps. The register split is part of the system.
Drop plain into your project, then ship the actual sections in an afternoon.
1 · install design
npx design-md add plain 2 · ship landing page
npx agentkit init --design plain dark minimal
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