Astryx is Meta's open-source React and StyleX design system, refined inside Meta for eight years across more than 13,000 apps and released in beta in June 2026.
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It is built for coding agents as well as people: a CLI writes agent docs into AGENTS.md or CLAUDE.md and hands agents templates and component props, and a remote MCP server lets AI tools search and read the documentation directly.
- 01
150+ accessible React 19 components, ready-to-ship templates, dark mode and token-level theming with CSS custom properties
- 02
`npx @astryxdesign/cli init --features agents` generates a component index, behavioural rules and CLI reference for your AI tool
- 03
CLI `build`, `template` and `component` commands give agents the closest page template, scaffolding and component props
- 04
Remote MCP server at astryx.atmeta.com/mcp with `search` and `get` tools for Claude Code, Cursor, Cline and other MCP clients
- 05
`swizzle` ejects a component's full source into your project, and styles can be overridden with Tailwind, CSS modules or plain CSS
Open Source
Astryx is free and open-source under the MIT license, including the core components, themes, CLI and the hosted MCP server. There are no paid tiers.
Best for
React teams that build internal tools or apps with coding agents and want a design system the agent can query and follow, so generated UI uses real components and tokens instead of ad hoc markup.
Not ideal for
Projects on React versions before 19, non-React stacks, or teams that need a stable 1.0 API, since Astryx is still in beta with frequent releases.
A mature, production-tested design system that treats coding agents as first-class users through its CLI and MCP server, making it a strong base for agent-built React UI.
Astryx 0.7.11 shipped on November 7, 2026 with touch-aware Popover growth animations, `delay` and `hideDelay` on DropdownMenuSubMenu, a `timezoneID` prop on Timestamp and many accessibility fixes; 0.7.10 shipped on November 6, 2026. The repository passed 19,000 GitHub stars in November 2026.
As of
Is Astryx free?+
Yes - Astryx is Open Source. Astryx is free and open-source under the MIT license, including the core components, themes, CLI and the hosted MCP server. There are no paid tiers.
Is Astryx open source?+
Yes - Astryx is open source. Astryx is free and open-source under the MIT license, including the core components, themes, CLI and the hosted MCP server. There are no paid tiers.
Who is Astryx best for?+
React teams that build internal tools or apps with coding agents and want a design system the agent can query and follow, so generated UI uses real components and tokens instead of ad hoc markup.
Who is Astryx not ideal for?+
Projects on React versions before 19, non-React stacks, or teams that need a stable 1.0 API, since Astryx is still in beta with frequent releases.
What are the best Astryx alternatives?+
The closest Astryx alternatives on ai.dosa.dev are Pieces for Developers, agenttrace, Vibe Kanban - all listed under Developer Productivity & Workflow.
Who makes Astryx?+
Astryx is developed by Meta. It is listed in the Developer Productivity & Workflow category on ai.dosa.dev.
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