Claude.ai vs Substack
59 token-level differences between these two design systems.
Background
#f8f8f6 → #ffffff Text
#121212 → #363737 Brand
#cd6f47 → #ff6719 Border
rgba(18,18,18,0.12) → rgba(0, 0, 0, 0.10) Display font
Anthropic Serif → Cahuenga Body size
17px → 19px colors 53 changed
~
bg #f8f8f6 → #ffffff ~
bg-soft #faf9f5 → #f6f6f3 ~
surface-warm #f3f0ea → #fafaf7 ~
text #121212 → #363737 ~
text-strong #000000 → #1a1a1a ~
text-muted #666660 → #878787 ~
text-faint #b4b4a8 → #a8a8a8 ~
brand #cd6f47 → #ff6719 ~
brand-deep #7d3c1f → #cc4a0e ~
border rgba(18,18,18,0.12) → rgba(0, 0, 0, 0.10) ~
border-soft rgba(18,18,18,0.06) → rgba(0, 0, 0, 0.06) ~
border-strong rgba(18,18,18,0.18) → rgba(0, 0, 0, 0.20) ~
success #5a8c5a → #0d8050 ~
warning #b58a3c → #d97706 ~
danger #b54a3c → #dc2626 ~
info #5a708c → #2563eb +
bg-elev #fafaf7 +
bg-cream #fbf9f4 +
text-soft #666c70 +
text-link #363737 +
brand-hover #e85412 +
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) −
bg-deep #f0efea −
surface-soft #fbfaf6 −
text-subtle #8e8e85 −
text-on-brand #ffffff −
text-on-cta #f8f8f6 −
text-on-dark #f3f0ea −
brand-soft #f3e7df −
brand-paler #fdf0e8 −
brand-strong #a85530 −
cta-bg #121212 −
cta-text #f8f8f6 −
cta-hover #2a2a2a −
cta-active #3d3d3d −
link #121212 −
link-hover #cd6f47 −
link-visited #7d3c1f −
scrim rgba(18,18,18,0.45) −
shadow-warm rgba(18,18,18,0.04) −
shadow-card rgba(18,18,18,0.06) −
shadow-elev rgba(18,18,18,0.10) −
shadow-modal rgba(18,18,18,0.18) −
success-soft #e6efe2 −
warning-soft #fbf3df −
danger-soft #fbe8e3 −
highlight #fbe8d6 typography 5 changed
~
display {"family":"Anthropic Serif","size":56} → {"family":"Cahuenga","size":56} ~
h1 {"family":"Anthropic Serif","size":48} → {"family":"Cahuenga","size":40} ~
h2 {"family":"Anthropic Serif","size":40} → {"family":"Cahuenga","size":32} ~
body {"family":"Anthropic Sans","size":17} → {"family":"Spectral","size":19} ~
label {"family":"Anthropic Mono","size":12} → {"family":"Monaco","size":13} radius 1 changed
~
button 8px → 6px spacing identical
No differences.