PostHog — design system & UI screens

Analytics · 4 screens · 28 sections · posthog.com

The single platform to analyze, test, observe, and deploy new features.

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

Decoded design system

PostHog's decoded design system: background #E1D7C2, text #4D4F46, accent #CD8407, link #E3DFD1, primary #E1D7C2; type scale h1 16px / h2 16px / body 12px; 4px spacing base; 4px base radius. The single interactive/action color is #CD8407 — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Role	Value
bg	`#E1D7C2`
surface	`#D8CEBA`
border	`#CAC2AF`
text	`#4D4F46`
text_muted	`#858275`
primary	`#E1D7C2`
accent	`#CD8407`
link	`#E3DFD1`
secondary	`#DDD6C5`
button_bg	`#CD8407`
button_text	`#23251D`

Using these colors

Action color #CD8407 — the single interactive color; only on things you click or must notice, never large fills.
primary #E1D7C2, secondary #DDD6C5 are visually the same color (Δ8) — treat as one role (the action color).
accent, button_bg are all #CD8407 — one role, not several (the action color).
accent #CD8407 — 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 #E3DFD1 — fails contrast on the background (~1.1:1) — this is a dark UI color, NOT a readable link; use the text or action color for links (verify against the reference).

Typography

Heading: Open Runde
Body: IBM Plex Sans
h1: 16px
h2: 16px
body: 12px

Spacing

base unit: 4px
scale: 2px, 4px, 5px, 6px, 8px, 10px, 12px, 16px, 20px, 24px

Radii

base: 4px
button: 6px

Shadows (elevation)

subtle: rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.25) 0px 25px 50px -12px
card: rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(14, 18, 22, 0.35) 0px 10px 38px -10px, rgba(14, 18, 22, 0.2) 0px 10px 20px -15px

Motion

Micro-interactions run at 150ms (dominant) with cubic-bezier(0.4, 0, 0.2, 1).

durations: 150ms · 300ms · 3000ms
easings: cubic-bezier(0.4, 0, 0.2, 1) · linear
animated properties: color, background-color, border-color, text-decoration-color

Native design tokens

Token	Value
`--viewport-padding`	`25px`

Button states (measured)

primary focus: outline 1px auto rgb(16, 16, 16)

Layout (measured)

container max-width: 900px
common grid: 2 columns

Motion choreography (measured)

Load order: svg.w-[189px]×2 → a.bg-button-shadow×2 → path.segment×3 → g.segment → li.ToastRoot → div.data-[state=active]:anim

Overlay recipe (measured)

dialog panel: #1E1F23 · radius 6px

Themes

dark counterpart: background #1D1F27, text #000000.

Responsive (measured)

mobile (390px): hero 24px · nav inline

Full design system, per-section tokens & DESIGN.md / Tailwind / CSS exports →