# mui/base-ui

Unstyled UI components for building accessible web apps and design systems. From the creators of Radix, Floating UI, and Material UI.

Repository: https://github.com/mui/base-ui
Canonical: https://ross.abutalabs.com/products/base-ui
Homepage: https://base-ui.com
Language: TypeScript
License: MIT
License Family: permissive
Topics: accessibility, design-system, react, react-components, wai-aria, base-ui, components, ui
Last push: 2026-08-26T11:28:00+00:00

## Health v2 (maintenance only)
Score: 91/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 96, longevity 65
- inputs: {"age_days": 922, "days_push": 7, "days_rel": 29, "gap_med": 29.0, "n_releases_24m": 9}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 10729, forks 520 (observed 2026-08-28T04:10:43.883196+00:00)

## What it is
Base UI is an unstyled React component library for building accessible user interfaces and design systems, created by the makers of Radix, Floating UI, and Material UI. It provides composable, WAI-ARIA-compliant components with no bundled CSS, working with any styling solution such as Tailwind, CSS Modules, or CSS-in-JS.

## Use cases
- build accessible react components
- create a custom design system
- headless ui components for react
- unstyled component library compatible with tailwind
- wai-aria compliant dialogs and popovers
- style my own ui primitives without visual opinions

## When to choose
- you need fully accessible React components with complete styling control
- you're building a design system or component library from scratch
- you want a tree-shakable, single-package library from an experienced team

## When to avoid
- you want pre-styled, ready-to-use components out of the box
- your project isn't React-based
- you need a quick prototype without writing your own styles

## Facets
- artifact type: library
- maturity: active
- function: ui-components, frontend-framework, accessibility
- domain: web-development, frontend, accessibility, web-design
- platform: browser
- tags: react, unstyled-components, wai-aria, design-system, headless-ui, typescript, nodejs, web-server

## Member repositories
- mui/base-ui (main) score 91

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:43.883196+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:17:56.096917+00:00, confidence not recorded.
  - readme: https://github.com/mui/base-ui (fetched 2026-08-28T04:10:43.883196+00:00, sha 8122d231cd78)
  - homepage: https://base-ui.com (fetched 2026-08-29T08:17:26.549788+00:00, sha cdbf309c3c75)
  - site_page: https://base-ui.com/react/overview/quick-start (fetched 2026-08-29T08:17:26.560226+00:00, sha 60d25e978ab6)
- Data as of 2026-08-30T08:39:29.467469+00:00.