Arc design system

What font does Arc use?

Arc’s website uses Marlin Soft SQ for headings and body text. Marlin Soft SQ is not on Google Fonts; the closest free match is Figtree.

Arc colour palette

Arc’s home page is light (#FFFFFF background, #3139FB text) and uses #3139FB for its main actions. Its palette: #FFFCEC, #FFFFFF, #3139FB, #000000, #696969, #2702C2.

• #FFFCEC
  56.7% · backgrounds
• #FFFFFF
  28.5% · backgrounds
• #3139FB
  13.8% · backgrounds, text
• #000000
  0.5% · backgrounds, text
• #696969
  0.3% · text
• #2702C2
  0.1% · backgrounds, text
• #FFFADD
  0.1% · text

Type scale

Each size the page sets text in, with its weight and line height. Arc’s largest type is 45.51px at weight 700.

Spacing and shape

Spacing sits on a 4px grid: 4px, 8px, 12px, 16px, 20px, 24px, 32px, 40px, 48px, 72px, 80px, 100px.

Corner radii: 4px, 8px, 10px, 18px, 22px. 2 shadow levels measured.

What makes Arc look like Arc

Mostly neutral: 86% of the page is #FFFCEC and #FFFFFF and other neutrals; #3139FB (13.8%) fills whole sections.

#2702C2 is an accent: 0.1% of the page, as small fills such as buttons and badges. Keep it to small areas.

The largest type (45.51px Marlin Soft SQ) is bold (700), tracked to -0.04em.

Open: text covers 6% of the page. Sections sit about 103px apart.

Arc DESIGN.md for Claude Code, Cursor and Lovable

A DESIGN.md is the brief an AI coding tool reads before it writes UI. This one carries everything on this page as rules a model follows: the allowed colours and what each is for, the fonts with free stand-ins, the type scale, spacing, corners, and the things Arc’s design never does.

Put it in your project root and ask your tool to follow it: “Read DESIGN.md and build [your product] in this design language.” It describes a style, not Arc’s product, so use your own name, words and images.

Download Arc DESIGN.md · View it as text

As CSS variables

The measured values as CSS custom properties, with free fonts standing in for licensed ones. Use them to learn from or to start a project in a similar style; Arc’s name, logo, words and images are theirs.

@import url("https://fonts.googleapis.com/css2?family=Figtree:wght@500;700&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@500;600;700&display=swap");
@import url("https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&display=swap");

:root {
  --color-background: #FFFFFF; /* Background */
  --color-surface: #FFFCEC; /* Surface */
  --color-text: #3139FB; /* Text */
  --color-action: #3139FB; /* Action */
  --color-on-action: #FFFFFF; /* On action */
  --color-000000: #000000; /* 0.5% of the page, as fills */
  --font-body: "Marlin Soft SQ", "Figtree", sans-serif; /* Marlin Soft SQ on the site; Figtree renders */
  --font-interface: "InterVariable", "Inter", sans-serif; /* InterVariable on the site; Inter renders */
  --font-code: "ABC Favorit Mono", "JetBrains Mono", monospace; /* ABC Favorit Mono on the site; JetBrains Mono renders */
  --type-display-large: 45.51px; /* Display Large, weight 700 */
  --type-display-large-leading: 42.25px;
  --type-display-large-tracking: -0.04em;
  --type-display-medium: 40px; /* Display Medium, weight 700 */
  --type-display-medium-leading: 39px;
  --type-display-medium-tracking: -0.04em;
  --type-display-small: 36px; /* Display Small, weight 700 */
  --type-display-small-leading: 36px;
  --type-display-small-tracking: -0.02em;
  --type-headline-large: 28px; /* Headline Large, weight 700 */
  --type-headline-large-leading: 30px;
  --type-headline-large-tracking: -0.05em;
  --type-headline-small: 24px; /* Headline Small, weight 400 */
  --type-headline-small-leading: 28.8px;
  --type-title: 20px; /* Title, weight 400 */
  --type-title-leading: 24px;
  --type-body-large: 17px; /* Body Large, weight 500 */
  --type-body-large-leading: 25.5px;
  --type-body-medium: 16px; /* Body Medium, weight 700 */
  --type-body-medium-leading: normal;
  --type-body-small: 14px; /* Body Small, weight 600 */
  --type-body-small-leading: normal;
  --type-body-small-tracking: -0.01em;
  --type-label-large: 13px; /* Label Large, weight 400 */
  --type-label-large-leading: normal;
  --type-label-small: 12px; /* Label Small, weight 600 */
  --type-label-small-leading: normal;
  --type-label-small-tracking: 0.033em;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-18: 72px;
  --space-20: 80px;
  --space-25: 100px;
  --space-32: 128px;
  --space-42: 168px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-2xl: 18px;
  --radius-3xl: 22px;
}

How this was measured

PikSpec’s scanner read the arc.net home page in Chrome at 1440px wide on 14 October 2026: the computed styles of its elements, the fonts that rendered and how much of the page each colour covers. Websites change; capture the page yourself with PikSpec for today’s values, any page, and exports in five formats.

Arc is a trademark of its owner. This page is an independent measurement and is not affiliated with or endorsed by Arc.

Similar light designs: Airbnb · Airtable · Allbirds · Anthropic · Apple · Asana

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