Amplitude — decoded design system

amplitude.com · light · modern · tailwind · deep decode — measured live

Amplitude's design system, decoded live by Mozaika: measured color roles, type scale, buttons with real hover/focus states, motion and the brand's own tokens.

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

Decoded design system

Amplitude's decoded design system: background #FFFFFF, text #565656, accent #000000, link #FFFFFF, primary #1E61F0; type scale h1 60px / h2 44px / body 14px; 4px spacing base; 8px base radius. The single interactive/action color is #1E61F0 — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Using these colors

• Action color #1E61F0 — the single interactive color; only on things you click or must notice, never large fills.
• primary, button_bg are all #1E61F0 — one role, not several (the action color).
• accent #000000 — accent for emphasis — keep it rare on the page.
• link #FFFFFF — fails contrast on the background (~1.0:1) — this is a dark UI color, NOT a readable link; use the text or action color for links (verify against the reference).
• secondary #B0C8FA — 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: Gellix
• Body: Gellix
• Mono: IBM Plex Mono
• h1: 60px
• h2: 44px
• body: 14px

Spacing

• base unit: 4px
• scale: 2px, 7px, 8px, 10px, 12px, 14px, 15px, 16px, 20px, 24px

Radii

• base: 8px
• button: 30px

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, 0.1) 0px 10px 15px -3px, rgba(0, 0, 0, 0.1) 0px 4px 6px -4px
• card: rgba(0, 0, 0, 0.1) 0px 0px 15px 5px
• overlay: rgba(0, 0, 0, 0.35) 0px 5px 15px 0px

Motion

Micro-interactions run at 300ms (dominant) with cubic-bezier(0.4, 0, 0.2, 1).

• durations: 300ms · 200ms · 150ms
• easings: cubic-bezier(0.4, 0, 0.2, 1) · ease
• animated properties: background-color, opacity, color, border-color

Native design tokens

Button states (measured)

• primary hover: background #1709E9
• primary focus: outline 1px auto rgb(16, 16, 16)

Layout (measured)

• container max-width: 1140px
• nav: 81px
• common grid: 2 columns

Motion choreography (measured)

Load order: span.inline-block → div.animate-fade-in → span.block×8 → nav.relative×2 → a.btn×4 → div.overflow-hidden×24

Responsive (measured)

• breakpoints: 375px · 380px · 400px · 480px · 641px · 768px
• mobile (390px): hero 16px · nav inline

Install it

Drop this measured system into any shadcn/Tailwind project in one command:

npx shadcn add mozaika.design/r/decode/amplitude.com

registry item · or query it over MCP: get_design_system("Amplitude")

Export: DESIGN.md

# Amplitude — Design System

> light, modern, high, tailwind — deep decode (measured live)

## Colors

| Role | Value |
|------|-------|
| bg | `#FFFFFF` |
| surface | `#F4F4F4` |
| border | `#E5E5E5` |
| text | `#565656` |
| text_muted | `#969696` |
| primary | `#1E61F0` |
| accent | `#000000` |
| link | `#FFFFFF` |
| secondary | `#B0C8FA` |
| button_bg | `#1E61F0` |
| button_text | `#FFFFFF` |

**Using these colors**

- **Action color** `#1E61F0` — the single interactive color; it appears only on things you click or must notice (buttons, key highlights), never on large fills or backgrounds.
- `primary`, `button_bg` are all `#1E61F0` — one role, not several (your action color).
- **accent** `#000000` — accent for emphasis — keep it rare on the page.
- **link** `#FFFFFF` — fails contrast on the background (~1.0:1) — this is a dark UI color, NOT a readable link; use the text or action color for links (verify against the reference).
- **secondary** `#B0C8FA` — 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.
- **Page coverage** (full-page screenshot pixels): `#FFFFFF` 76.7% · `#6781CF` 8.4% · `#080D1D` 8.1% · `#EFEFF2` 6.8%

## Typography

- Heading: **Gellix** _(free fallback: Newsreader)_
- Body: **Gellix** _(free fallback: Newsreader)_
- Mono: **IBM Plex Mono** _(measured)_

| Role | Size / weight · line-height · tracking |
|------|------------------------------------------|
| hero | 60px / 700 · lh 70px · tracking -1px |
| h2 | 44px / 600 · lh 51px · tracking -0.22px |
| h3 | 38px / 700 · lh 42px · tracking -1.14px |
| body | 14px / 400 · lh 19px |
| small | 13px / 400 · lh 19px |

- Weight ladder: 400 · 500 · 600 · 700 — use these exact measured weights, not the 400/600 defaults.

> **Fonts —** Gellix may be proprietary — safe free fallback: Newsreader (Google Fonts).

## Spacing
- base unit: 4px (inferred from the measured scale)
- measured scale: 2px, 7px, 8px, 10px, 12px, 14px, 15px, 16px, 20px, 24px — snap all gaps/padding to these
- section rhythm: 96px top/bottom padding per section (measured)

## Radius
- base: 8px
- button: 30px
- card: 6px
- pill: 9999px
- sharp: 3px

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `#1E61F0` / `#FFFFFF` | none | 30px | 12px 30px 12px 30px | 600 16px | none |
| secondary | `#000000` / `#FFFFFF` | 1px solid rgb(0, 0, 0) | 9999px | 0px 16px 0px 16px | 600 16px / -0.04px | none |

**States (measured, not guessed)**

- primary hover: background `#1709E9`
- primary focus: outline `1px auto rgb(16, 16, 16)`
- transition: `all 0.25s ease`

## 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, 0.1) 0px 10px 15px -3px, rgba(0, 0, 0, 0.1) 0px 4px 6px -4px`
- card: `rgba(0, 0, 0, 0.1) 0px 0px 15px 5px`
- overlay: `rgba(0, 0, 0, 0.35) 0px 5px 15px 0px`

## Motion
- durations: 300ms (dominant) · 200ms · 150ms
- easings: `cubic-bezier(0.4, 0, 0.2, 1)` (dominant) · `ease`
- animated properties: background-color, opacity, color, border-color

Micro-interactions use the dominant duration + easing; nothing on the page animates slower than the longest duration above — don't invent springier motion.

## Their own tokens (verbatim from :root)

| Token | Value |
|-------|-------|
| `--font-ibm-plex-sans` | `"__IBM_Plex_Sans_6d343d","__IBM_Plex_Sans_Fallback_6d343d"` |
| `--font-ibm-plex-serif` | `"__IBM_Plex_Serif_bddae2","__IBM_Plex_Serif_Fallback_bddae2"` |
| `--head-nav-height` | `4rem` |
| `--benchmark-section-filter-container-height` | `4rem` |
| `--sheen-x` | `100%` |
| `--sheen-y` | `0px` |

Prefer these names when extending their system — it's the brand's actual vocabulary.

## Layout (measured)
- container max 1140px · common grid: 2-col
- nav: 81px

| Section (y) | Height | Cols | Gap | Pad y | Split |
|---|---|---|---|---|---|
| 139 | 1011 | — | — | 0/0 | — |
| 1150 | 1271 | 2 | 64 | 0/0 | — |
| 2421 | 767 | — | — | 0/0 | — |
| 3188 | 1952 | — | — | 128/96 | — |

## Motion choreography (measured)
Load order: `span.inline-block` @0ms → `div.animate-fade-in` @0ms → `span.block`×8 @89ms → `nav.relative`×2 @512ms → `a.btn`×4 @512ms → `div.overflow-hidden`×24 @512ms
- `div.animate-fade-in` — opacity 0→1 — 600ms ease
- `span.block` ×8 — opacity 0→1 — 200ms ease (delay 50ms)
- `span.inline-block` — opacity 1→1 — 800ms steps(1) · loops

Rebuild the timeline, not just the durations — order, delays and staggers above are the choreography.

## Components (measured)
- link: #1E61F0 · underline

## Responsive (measured)
- breakpoints: 375px · 380px · 400px · 480px · 641px · 768px
- mobile (390px): hero 16px · body 16px · nav: inline

## 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.
Hover/focus states, shadows and motion timings above are measured from the live page — match them exactly, don't re-guess them.

← All decoded design systems

An automated reading of Amplitude's publicly-visible CSS (colors, fonts, spacing, motion) — not affiliated with amplitude.com. No screenshots stored. Removal requests: hello@mozaika.design.