Radix UI

Unstyled accessible React primitives, plus Themes, Colors and Icons

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Radix UI is a family of four things on one site: Primitives (about 35 unstyled, WAI-ARIA-conformant React components), Themes (a pre-styled component library), Colors (12-step perceptual light and dark scales) and Icons. Primitives handle the hard parts — focus management, typeahead, collision-aware positioning, controlled and uncontrolled state, portals and RTL — and leave every pixel to you. It is the substrate under shadcn/ui and a large share of modern React design systems; the project is now maintained by WorkOS.

Install

npm install radix-ui

For an agent

This is the accessibility layer, not the design layer — reach for Primitives when you are building a bespoke design system and want correct dialog focus traps, roving tabindex and collision-aware popovers without writing them. In practice you rarely install it directly: `npx shadcn@latest add dialog` already vendors Radix into the project, so check for `components/ui/` before adding a second copy. Use the single `radix-ui` package rather than the old per-component `@radix-ui/react-*` packages for new work, keep Radix Colors in mind as a ready-made 12-step token set, and note there is no llms.txt so the docs must be fetched page by page.

Why it is here. Radix set the modern standard for headless, accessible React components, and shadcn/ui made it the de facto foundation of the entire copy-paste component ecosystem. Almost everything else in this index sits on top of it.

Install command, framework, licence and component list.

Facts

License: MIT
Pricing: Free, Open source
Framework: React, Next.js
Styling: Vanilla CSS, CSS custom properties, Tailwind CSS, CSS Modules
Distribution: npm package, GitHub repository, Copy-paste snippet
Platform: Web
Content type: Code, Prose / writing, Design tokens / theme files, Icons
Agent readiness: Structured documentation, Readable open source, Copy-paste ready code
Accessibility: Full ARIA pattern implemented, Keyboard navigable, Focus management and visible focus, Screen reader tested, RTL and i18n aware, Semantic HTML
Maturity: Actively maintained
GitHub stars: 19,164
Package: radix-ui

Components it ships

35 total

Helps you build

Settings Web App Account Web App Admin Panel Command Palette Action Sheet Filtering Items Submitting A Form Showing Input Error Multi Step Form In App Notifications Share And Permissions Notification Settings

Notable for

foundation under shadcn/ui
WAI-ARIA APG conformance
Radix Colors 12-step light and dark scales
maintained by WorkOS
single `radix-ui` package replaces per-component installs

Provenance

Verified 2026-08-16. HTTP 200. https://www.radix-ui.com/primitives/docs/overview/introduction, https://www.radix-ui.com/themes/docs/overview/getting-started, api.github.com/repos/radix-ui/primitives/contents/packages/react (package listing), llms.txt returns 404

Also in Component Libraries

radix-ui.comTier S