Overview
Astryx is an open source design system that grew inside Meta over the last eight years, where it became the most-used and largest design system in the company — powering 13,000+ apps and shaped by the engineers, designers, and product teams who depend on it every day.
It ships 150+ accessible components, brand-level theming, dark mode, ready-to-ship templates, and a CLI as one cohesive system. You import pre-built CSS and use typed React components — no build plugin, no styling library to adopt — and both people and AI assistants build with the same tooling.
What makes Astryx different:
- Open internals. Components are built to be composed at any level, not locked behind a closed top-level API. The building blocks you'd reach for are exported directly, and when you need to go deeper, swizzle ejects a component's full source into your project to own.
- No styling lock-in. Astryx authors its styles with StyleX, but that's invisible to consumers. Override with
className using Tailwind, CSS modules, or plain CSS — whatever your project already uses.
- Customize without wrapping. A theme is a set of CSS custom property overrides, so a designer can make Astryx unmistakably theirs without forking or wrapping component source.
- Built for people and agents. The API, docs, and CLI are designed together so a person and an AI assistant build the same way, from the same reference.
Getting Started
Astryx requires React 19 or later (react and react-dom are peer dependencies of @astryxdesign/core).
Install Astryx, a theme, and its peer dependencies:
# npm
npm install @astryxdesign/core @astryxdesign/theme-neutral @stylexjs/stylex
npm install -D @astryxdesign/cli
# pnpm
pnpm add @astryxdesign/core @astryxdesign/theme-neutral @stylexjs/stylex
pnpm add -D @astryxdesign/cli
# yarn
yarn add @astryxdesign/core @astryxdesign/theme-neutral @stylexjs/stylex
yarn add -D @astryxdesign/cli
The simplest setup is a few CSS imports plus a theme provider — no build plugin, no PostCSS or Babel config. See the @astryxdesign/core README for the full guide (Next.js, Tailwind, Vite, and CDN).
For reliable CLI access, add a script to your package.json:
"scripts": {
"astryx": "node node_modules/@astryxdesign/cli/clients/cli/bin/astryx.mjs"
}
Then use it as npm run astryx -- component --list. This avoids path errors when AI assistants or new developers invoke the CLI directly.
Packages
| Package |
Description |
README |
@astryxdesign/core |
Components, theme system, and utilities |
README |
@astryxdesign/cli |
CLI tooling: component docs, templates, scaffolding, themes, and codemods |
README |
@astryxdesign/build |
Build plugins for StyleX source builds |
README |
@astryxdesign/theme-* |
Seven ready-made, fully customizable themes (neutral, butter, chocolate, matcha, stone, gothic, y2k) |
README |
@astryxdesign/lab (experimental components) is used internally for Storybook and the sandbox and is not published to npm. @astryxdesign/vega (Vega/Vega-Lite chart wrapper) and @astryxdesign/charts (chart components) are published to npm only under the @canary dist-tag — there is no stable release yet.
Principles
These are the promises Astryx makes to the people building on it.
- Guidance over enforcement. Components give you capability rather than guardrails that fight you. Design opinions live in docs and examples — if you pass a value, the component renders it.
- Strong, documented conventions. Every component follows the same naming, prop, and composition rules, and every one is thoroughly documented — so once you've learned a few, the rest feel familiar, and both people and AI can predict how an unfamiliar component behaves.
- One system for humans and AI. The API, conventions, docs, and CLI are designed together so people and AI assistants build the same way. Every change that made Astryx easier for AI made it easier for people too.
- Earned by measurement. We test conventions rather than assert them, hold the results loosely, and revisit them when a new situation proves them wrong.
Architecture
Foundations
The building blocks for visually cohesive and accessible interfaces: typography, color, layout, and accessibility.
Components
A library of 150+ reusable UI building blocks with full TypeScript support.
Patterns
Battle-tested design solutions for common interactions and workflows: table pages, detail page layouts, form wizards, navigation patterns, data entry flows.
Project Structure
| Directory |
Purpose |
apps/ |
Example apps, the docsite, and Storybook |
packages/ |
Published packages: core, cli, build, themes |
internal/ |
Internal tooling: test utilities, eslint plugin, vibe tests |
Contributing
We welcome contributions! See CONTRIBUTING.md for the full guide.
Questions, or want a hand with a PR? Come find us in
Discord.
Our conventions and review rubrics live in the
Contributing wiki —
including API Conventions,
Design Conventions,
the Component Lifecycle,
and the Contributing Templates
and Blog Review
rubrics. Read the relevant one before opening a PR.
Quick start for contributors: this repo uses Node 22+ on an active LTS line
and pnpm 11. Install pnpm directly, or enable
Corepack once so the pinned pnpm version
installs automatically:
corepack enable
pnpm install
If corepack is missing, install pnpm directly or install Corepack manually;
see the troubleshooting notes in
CONTRIBUTING.md.
License
MIT
Astryx 是一个开源的、为 AI 智能体准备好的设计系统，由 Meta 内部历经八年打造。它提供 150 多个无障碍 React 组件、品牌主题定制、深色模式、现成模板，以及一个 CLI 命令行工具，这些功能共同构成一个统一的系统。