MozaikaDesign system

Cal.com — Design System

light · modern · medium · custom · confidence 90%

Cal.com built its own display face and leads with it: Cal Sans at 64px/600 in charcoal #242424 on warm grey #F4F4F4, Inter at 16px underneath, 12px-radius buttons. Booking-page embeds appear as live, functional heroes — scheduling infrastructure that proves itself by letting you book the demo inside the landing page.

Open in Mozaika →

This is a static, crawlable rendering for search & AI engines. The interactive version — filters, live decode console, copy & export — is at https://mozaika.design/ds/cal-com.

Tokens

Cal.com's decoded design system: background #F4F4F4, text #374151, accent #0000EE, link #0000EE, primary #374151; type scale h1 64px / h2 48px / body 14px; 4px spacing base; 8px base radius. The single interactive/action color is #0000EE — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

RoleValue
bg#F4F4F4
surface#E8E9EA
border#D7D9DB
text#374151
text_muted#7E858E
primary#374151
accent#0000EE
link#0000EE
secondary#9CA3AF

Using these colors

Typography

Spacing

Radii

Per-section tokens (11)

Export: DESIGN.md

# Cal.com — Design System

> light, modern, medium, custom

Cal.com built its own display face and leads with it: Cal Sans at 64px/600 in charcoal #242424 on warm grey #F4F4F4, Inter at 16px underneath, 12px-radius buttons. Booking-page embeds appear as live, functional heroes — scheduling infrastructure that proves itself by letting you book the demo inside the landing page.

## Colors

| Role | Value |
|------|-------|
| bg | `#F4F4F4` |
| surface | `#E8E9EA` |
| border | `#D7D9DB` |
| text | `#374151` |
| text_muted | `#7E858E` |
| primary | `#374151` |
| accent | `#0000EE` |
| link | `#0000EE` |
| secondary | `#9CA3AF` |

**Using these colors**

- **Action color** `#0000EE` — the single interactive color; it appears only on things you click or must notice (buttons, key highlights), never on large fills or backgrounds.
- `accent`, `link` are all `#0000EE` — one role, not several (your action color).
- **accent** `#0000EE` — THE accent / action color — interactive & must-notice only (buttons, links, focus, one key highlight); never large fills or backgrounds. Scarcity is what makes it read as designed.
- **primary** `#374151` — ≈ the text color — a foreground/text color, not an action color (action = #0000EE).
- **secondary** `#9CA3AF` — optional secondary accent — LOW decode confidence; use rarely (a status color or a single decorative moment) or omit it entirely. Prefer one accent unless the reference clearly shows two.

## Typography

- Heading: **Cal Sans** _(free fallback: Newsreader)_
- Body: **Inter**
- h1: 64px
- h2: 48px
- body: 14px

> **Fonts —** Cal Sans may be proprietary — safe free fallback: Newsreader (Google Fonts). Inter — free, on Google.

## Spacing
- base unit: 4px
- scale: 2px, 4px, 6px, 8px, 12px, 16px, 24px, 32px

## Radius
- base: 8px
- button: 8px

## Primary button
- bg `None` · text `None` · radius None

## How to apply
Paste the Tailwind `@theme` (or CSS variables) as your base, then build each
section to its spec — verify every color, radius, and font against these tokens.

Export: Tailwind v4 (@theme)

@theme {
  /* action color #0000EE — the one interactive color; buttons/links/emphasis only, never large fills. */
  --color-bg: #F4F4F4;
  --color-surface: #E8E9EA;
  --color-border: #D7D9DB;
  --color-text: #374151;
  --color-text-muted: #7E858E;
  --color-primary: #374151;  /* ≈ the text color — a foreground/text color, not an action color (action = #0000EE). */
  --color-accent: #0000EE;  /* THE accent / action color — interactive & must-notice only (buttons, links, focus, one key highlight); never large fills or backgrounds. Scarcity is what makes it read as designed. */
  --color-link: #0000EE;  /* inline text links — shares the action color. */
  --color-secondary: #9CA3AF;  /* optional secondary accent — LOW decode confidence; use rarely (a status color or a single decorative moment) or omit it entirely. Prefer one accent unless the reference clearly shows two. */
  /* fonts: Cal Sans may be proprietary — safe free fallback: Newsreader (Google Fonts). Inter — free, on Google. */
  --font-heading: "Cal Sans", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: "Inter", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --text-h1: 64px;
  --text-h2: 48px;
  --text-body: 14px;
  --radius-base: 8px;
  --radius-button: 8px;
  --spacing-1: 2px;
  --spacing-2: 4px;
  --spacing-3: 6px;
  --spacing-4: 8px;
  --spacing-5: 12px;
  --spacing-6: 16px;
  --spacing-7: 24px;
  --spacing-8: 32px;
}

Export: CSS variables

:root {
  /* action color #0000EE — the one interactive color; buttons/links/emphasis only, never large fills. */
  --bg: #F4F4F4;
  --surface: #E8E9EA;
  --border: #D7D9DB;
  --text: #374151;
  --text-muted: #7E858E;
  --primary: #374151;  /* ≈ the text color — a foreground/text color, not an action color (action = #0000EE). */
  --accent: #0000EE;  /* THE accent / action color — interactive & must-notice only (buttons, links, focus, one key highlight); never large fills or backgrounds. Scarcity is what makes it read as designed. */
  --link: #0000EE;  /* inline text links — shares the action color. */
  --secondary: #9CA3AF;  /* optional secondary accent — LOW decode confidence; use rarely (a status color or a single decorative moment) or omit it entirely. Prefer one accent unless the reference clearly shows two. */
  --font-heading: "Cal Sans", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: "Inter", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --radius: 8px;
  --radius-button: 8px;
}
/* fonts: Cal Sans may be proprietary — safe free fallback: Newsreader (Google Fonts). Inter — free, on Google. */