Sunbelt Computer Software

PL/B Language Development and Support

UnoCSS: The instant on-demand Atomic CSS engine

UnoCSSInstant On-demand Atomic CSS Engine

Customizable · Powerful · Fast · Joyful

Getting Started

Interactive Docs

Fully Customizable

No core utilities, all functionalities are provided via presets.

Getting Started

Instant

No parsing, no AST, no scanning. It's 5x faster than Windi CSS or Tailwind CSS JIT.

Lightweight

Zero deps and browser friendly: ~6kb min+brotli

Rich Integrations

First class support of Vite, Webpack, PostCSS, CLI, VS Code, ESLint, etc.

Learn more

Shortcuts

Aliasing or grouping utilities, dynamically

Configuration and usage

Attributify Mode

Group utilities in attributes

@unocss/preset-attributify

Pure CSS Icons

Use any icon as a single class

@unocss/preset-icons

Variant Groups

Shorthand for group utils with common prefixes

@unocss/transformer-variant-group

CSS Directives

Reuse utils in CSS with @apply directive

@unocss/transformer-directives

Compilation Mode

Synthesizes multiple classes into one at build time

@unocss/transformer-compile-class

Inspector

Inspect and debug interactively

@unocss/inspector

CDN Runtime Build

Use UnoCSS with one line of CDN import

@unocss/runtime

Sponsored by

Special Sponsor

Vercel

Platinum Sponsors

VoidZero

StackBlitz

Vite

Gold Sponsors

Workleap IT

Storyblok

Silver Sponsors

Mux

Ben Hong

Sponsors

openclaw

Marcel Laverdet

Checkly

Stefan Smiljkovic

Ulrich Stark

n8n - Workflow Automation

WebWorkerTech

RainbowBird

TANAKA Kohji

Neko

xjccc

Jianqi Pan

Yee

David Vallejo

Avantpage

Bjorn Lu

kang

Daniel Roe

m1heng

Ivan Demchuk

SerKo

Rudi Bruchez

blackbird GmbH

Eduardo San Martin Morote

Michel EDIGHOFFER

Emmanuel Salomon

wū yāng

yoyoIU

Anthony Fu's backers

Anthony Fu's past sponsors