xAI vs Substack
63 token-level differences between these two design systems.
Background
#ffffff → #ffffff Text
#0a0a0a → #363737 Brand
#0a0a0a → #ff6719 Border
#d5d9e2 → rgba(0, 0, 0, 0.10) Display font
Universal Sans Display → Cahuenga Body size
16px → 19px colors 53 changed
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bg-soft #fafafa → #f6f6f3 ~
surface #f9f8f6 → #ffffff ~
text #0a0a0a → #363737 ~
text-strong #0a0a0a → #1a1a1a ~
text-muted #6b7280 → #878787 ~
brand #0a0a0a → #ff6719 ~
brand-hover #1f1f1f → #e85412 ~
on-brand #0a0a0a → #ffffff ~
border #d5d9e2 → rgba(0, 0, 0, 0.10) ~
border-soft rgba(10,10,10,0.08) → rgba(0, 0, 0, 0.06) ~
border-strong rgba(10,10,10,0.16) → rgba(0, 0, 0, 0.20) ~
success #248430 → #0d8050 ~
info #3b82f6 → #2563eb ~
warning #b45309 → #d97706 ~
danger #be2e31 → #dc2626 +
bg-elev #fafaf7 +
bg-cream #fbf9f4 +
surface-warm #fafaf7 +
text-soft #666c70 +
text-faint #a8a8a8 +
text-link #363737 +
brand-deep #cc4a0e +
brand-tint rgba(255, 103, 25, 0.10) +
brand-tint-strong rgba(255, 103, 25, 0.18) +
border-warm rgba(0, 0, 0, 0.08) +
selection-bg rgba(255, 103, 25, 0.20) +
shadow-soft rgba(0, 0, 0, 0.06) +
shadow-medium rgba(0, 0, 0, 0.10) +
reading-rule rgba(0, 0, 0, 0.08) −
surface-terminal #f8f7f5 −
surface-card #fffffff2 −
surface-hover rgba(10,10,10,0.04) −
surface-press rgba(10,10,10,0.08) −
header-bg rgba(255,255,255,0.85) −
text-terminal #262626 −
text-subtle #8a8f98 −
text-on-brand #ffffff −
brand-active #2c2c2c −
link #111827 −
link-hover #0a0a0a −
link-visited #111827 −
ring #3b82f6 −
scrim rgba(10,10,10,0.5) −
shadow-color rgba(0,0,0,0.10) −
terminal-fg #262626 −
terminal-green #248430 −
terminal-green-bg #e3efe4 −
terminal-red #be2e31 −
terminal-red-bg #f8eaea −
success-bg #ecfdf3 −
info-bg #f0f8ff −
warning-bg #fffcf0 −
danger-bg #fff0f0 typography 5 changed
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display {"family":"Universal Sans Display","size":80} → {"family":"Cahuenga","size":56} ~
h1 {"family":"Universal Sans Display","size":60} → {"family":"Cahuenga","size":40} ~
h2 {"family":"Universal Sans Display","size":48} → {"family":"Cahuenga","size":32} ~
body {"family":"Universal Sans","size":16} → {"family":"Spectral","size":19} ~
label {"family":"SFMono-Regular","size":13} → {"family":"Monaco","size":13} radius 1 changed
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button 8px → 6px spacing 4 changed
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xs 0px → 4px ~
sm 4px → 8px ~
md 12px → 16px ~
xl 64px → 48px