UnoCSS
An on-demand atomic CSS engine.
What it does
An on-demand atomic CSS engine.
When it fits
Configuring a utility-class workflow through presets and custom rules.
Other options in this category
- chroma.js — Generating palettes and color scales for interfaces or charts.
- Class Variance Authority — Managing size, color, and state variants in a component system.
- clsx — Building className values from component states and optional styles.
- CSS Modules — Writing stylesheets without exposing every class name globally.
- Emotion — Building component-level styles with a flexible CSS-in-JS API.
Source
Editorial overview reviewed on October 24, 2026. Follow the source for current setup, compatibility, and licensing.