Optimism vs Substack
60 token-level differences between these two design systems.
Background
#ffffff → #ffffff Text
#000000 → #363737 Brand
#ff0420 → #ff6719 Border
#e0e0e0 → rgba(0, 0, 0, 0.10) Display font
Optimism Display → Cahuenga Body size
16px → 19px colors 52 changed
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bg-soft #f5f5f5 → #f6f6f3 ~
text #000000 → #363737 ~
text-muted #5a5a5a → #878787 ~
brand #ff0420 → #ff6719 ~
brand-hover #cc0319 → #e85412 ~
brand-deep #7d020f → #cc4a0e ~
border #e0e0e0 → rgba(0, 0, 0, 0.10) ~
border-soft #ebebeb → rgba(0, 0, 0, 0.06) ~
border-strong #c0c0c0 → rgba(0, 0, 0, 0.20) +
bg-elev #fafaf7 +
bg-cream #fbf9f4 +
surface #ffffff +
surface-warm #fafaf7 +
text-strong #1a1a1a +
text-soft #666c70 +
text-faint #a8a8a8 +
text-link #363737 +
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) +
success #0d8050 +
warning #d97706 +
danger #dc2626 +
info #2563eb +
shadow-soft rgba(0, 0, 0, 0.06) +
shadow-medium rgba(0, 0, 0, 0.10) +
reading-rule rgba(0, 0, 0, 0.08) −
bg-strong #e6e6e6 −
bg-dark #000000 −
bg-dark-elev #1a1a1a −
bg-dark-deep #0a0a0a −
surface-card #ffffff −
surface-card-soft #f5f5f5 −
text-body #1a1a1a −
text-subtle #8a8a8a −
text-on-dark #ffffff −
text-on-dark-soft #a8a8a8 −
brand-active #a30214 −
brand-soft #ff04201a −
brand-glow rgba(255,4,32,0.40) −
brand-bright #ff3344 −
semantic-up #10b981 −
semantic-down #ef4444 −
semantic-warning #f59e0b −
semantic-info #ff0420 −
gradient-hero linear-gradient(135deg, #000000 0%, #1a1a1a 60%, #7d020f 100%) −
gradient-red linear-gradient(135deg, #ff0420 0%, #cc0319 100%) −
focus-ring rgba(255,4,32,0.45) −
scrim rgba(0,0,0,0.65) −
link #ff0420 −
link-hover #cc0319 typography 5 changed
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display {"family":"Optimism Display","size":72} → {"family":"Cahuenga","size":56} ~
h1 {"family":"Optimism Display","size":40} → {"family":"Cahuenga","size":40} ~
h2 {"family":"Optimism Display","size":32} → {"family":"Cahuenga","size":32} ~
body {"family":"Inter","size":16} → {"family":"Spectral","size":19} ~
label {"family":"JetBrains Mono","size":11} → {"family":"Monaco","size":13} radius 2 changed
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button 12px → 6px ~
pill 999px → 9999px spacing 1 changed
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xl 64px → 48px