# kuma-ui/kuma-ui

🐻‍❄️ A Headless, Utility-First, and Zero-Runtime UI Component Library ✨

Repository: https://github.com/kuma-ui/kuma-ui
Canonical: https://ross.abutalabs.com/products/kuma-ui
Homepage: https://kuma-ui.com
Language: TypeScript
License: MIT
License Family: permissive
Topics: css-in-js, react, zero-runtime, utility-first, headless
Last push: 2026-05-29T09:11:14+00:00

## Health v2 (maintenance only)
Score: 86/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 84, release rhythm 86, longevity 89
- inputs: {"age_days": 1252, "days_push": 96, "days_rel": 96, "gap_med": 0, "n_releases_24m": 30}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1858, forks 69 (observed 2026-08-28T04:05:45.087490+00:00)

## What it is
Kuma UI is a headless, utility-first React component library with zero-runtime CSS extraction, using a hybrid approach that statically extracts styles at build time while supporting dynamic styles. It provides unstyled components (Box, Flex, Grid, Text, Button, etc.) with utility props, theming, and Next.js/Vite/webpack plugins including React Server Components support.

## Use cases
- style react components without runtime css-in-js overhead
- build custom design systems with headless react components
- use utility-first styling with autocomplete in react
- adopt css-in-js compatible with react server components
- extract css at build time in next.js or vite projects
- replace styled-components or emotion for better performance

## When to choose
- you want zero-runtime performance with css-in-js ergonomics
- you need headless components with full styling control
- your app uses Next.js App Router / React Server Components
- you prefer utility props and typed style autocomplete

## When to avoid
- you want pre-styled, opinionated component designs out of the box
- your project is not React 18+ or uses another framework
- you rely heavily on fully dynamic runtime styling
- you need a very mature ecosystem like Tailwind or Chakra

## Facets
- artifact type: library
- maturity: active
- function: ui-components, css-framework, frontend-framework, templating
- domain: frontend, web-development, web-design
- platform: cross-platform
- tags: css-in-js, zero-runtime, headless-components, utility-first, react, nextjs, rsc, typescript, style-extraction, nodejs, web-server

## Member repositories
- kuma-ui/kuma-ui (main) score 86

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:45.087490+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 2026-08-30T03:16:13.019377+00:00, confidence not recorded.
  - readme: https://github.com/kuma-ui/kuma-ui (fetched 2026-08-28T04:05:45.087490+00:00, sha 0b94bf49e8b5)
  - homepage: https://kuma-ui.com (fetched 2026-08-29T10:55:30.825878+00:00, sha 2607000f15f2)
  - site_page: https://www.kuma-ui.com/docs/install (fetched 2026-08-29T10:55:30.837422+00:00, sha 158355c70d0b)
  - site_page: https://www.kuma-ui.com/docs (fetched 2026-08-29T10:55:30.834911+00:00, sha 49d5300f9af7)
  - site_page: https://www.kuma-ui.com/docs/Concepts/Utility (fetched 2026-08-29T10:55:30.839272+00:00, sha 680eaad84999)
  - site_page: https://www.kuma-ui.com/docs/Concepts/Hybrid (fetched 2026-08-29T10:55:30.840893+00:00, sha 1a1f2ce7b0f5)
  - site_page: https://www.kuma-ui.com/docs/Concepts/Headless (fetched 2026-08-29T10:55:30.842473+00:00, sha 51176028a6ba)
  - site_page: https://www.kuma-ui.com/docs/Components/UtilityProps (fetched 2026-08-29T10:55:30.843964+00:00, sha 5016cf78a142)
  - site_page: https://www.kuma-ui.com/docs/Components/Box (fetched 2026-08-29T10:55:30.845436+00:00, sha ee9f31c1379c)
  - site_page: https://www.kuma-ui.com/docs/Components/Flex (fetched 2026-08-29T10:55:30.846782+00:00, sha 1198c13a951c)
- Data as of 2026-08-30T08:39:29.467469+00:00.