unocss/unocss

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

18942 stars · 982 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

UnoCSS is an instant on-demand atomic CSS engine that generates utility CSS classes as they are used, with no core utilities - all functionality comes from composable presets. It integrates with Vite, Webpack, PostCSS, Nuxt, Astro, Next.js, Svelte, CLI, and offers a browser CDN runtime and developer inspector.

Use cases

• generate utility-first css on demand instead of writing stylesheets
• tailwind css alternative with faster build times
• use atomic css classes in vite or webpack projects
• style web components with shadow-dom inline css
• use icons as css classes without an icon library
• group utilities in html attributes instead of class names
• add utility css to nuxt or astro apps

When to choose

• you want a fast, fully customizable atomic CSS engine with preset-based utilities
• you are on Vite/Nuxt/Astro/Svelte and want first-class integration with HMR
• you need Tailwind-like utilities but with custom rules, shortcuts, and attributify mode
• you want a zero-dependency, browser-friendly runtime for prototypes via CDN

When to avoid

• your team is already invested in Tailwind CSS and its ecosystem plugins
• you prefer semantic, component-scoped CSS over utility classes
• you need a webpack setup beyond global mode or rely on CommonJS-only tooling

Facets

library · maturity active

css-framework build-tool plugin-system frontend web-development web-design developer-tools browser cli editor-plugin atomic-css utility-first vite-plugin tailwind-alternative windicss on-demand-css attributify-mode css-icons nodejs web-server

Member repositories

For agents

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