GitHub Copilot vs Substack
61 token-level differences between these two design systems.
Background
#ffffff → #ffffff Text
#1f2328 → #363737 Brand
#000000 → #ff6719 Border
#d0d7de → rgba(0, 0, 0, 0.10) Display font
Mona Sans → Cahuenga Body size
18px → 19px colors 53 changed
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surface #f6f8fa → #ffffff ~
text #1f2328 → #363737 ~
text-strong #000000 → #1a1a1a ~
text-muted #59636e → #878787 ~
brand #000000 → #ff6719 ~
brand-hover #1f2328 → #e85412 ~
success #1a7f37 → #0d8050 ~
warning #9a6700 → #d97706 ~
danger #cf222e → #dc2626 ~
border #d0d7de → rgba(0, 0, 0, 0.10) ~
border-strong #afb8c1 → rgba(0, 0, 0, 0.20) ~
shadow-medium rgba(31,35,40,0.08) → rgba(0, 0, 0, 0.10) +
bg-elev #fafaf7 +
bg-cream #fbf9f4 +
bg-soft #f6f6f3 +
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-soft rgba(0, 0, 0, 0.06) +
border-warm rgba(0, 0, 0, 0.08) +
selection-bg rgba(255, 103, 25, 0.20) +
info #2563eb +
shadow-soft rgba(0, 0, 0, 0.06) +
reading-rule rgba(0, 0, 0, 0.08) −
bg-inverse #0d1117 −
bg-overlay #ffffffee −
surface-strong #eaeef2 −
surface-on-dark #161b22 −
surface-strong-on-dark #21262d −
text-subtle #6e7781 −
text-on-dark #f0f6fc −
text-on-dark-muted #9198a1 −
brand-active #3d444d −
brand-on-dark #ffffff −
brand-on-dark-hover #f0f6fc −
accent #0969da −
accent-hover #0550ae −
accent-soft #ddf4ff −
accent-emphasis #0969da −
accent-on-dark #4493f8 −
success-soft #dafbe1 −
warning-soft #fff8c5 −
danger-soft #ffebe9 −
done #8250df −
border-muted #d8dee4 −
border-on-dark #3d444d −
scrim rgba(140,149,159,0.15) −
shadow-small rgba(31,35,40,0.04) −
shadow-large rgba(31,35,40,0.12) typography 5 changed
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display {"family":"Mona Sans","size":96} → {"family":"Cahuenga","size":56} ~
h1 {"family":"Mona Sans","size":64} → {"family":"Cahuenga","size":40} ~
h2 {"family":"Mona Sans","size":56} → {"family":"Cahuenga","size":32} ~
body {"family":"Mona Sans","size":18} → {"family":"Spectral","size":19} ~
label {"family":"MonaspiceNe","size":12} → {"family":"Monaco","size":13} radius 1 changed
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button 8px → 6px spacing 2 changed
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lg 40px → 32px ~
xl 64px → 48px