⚡ CSS JavaScript Libraries

JavaScript CSS libraries allow developers to manage and enhance Cascading Style Sheets through JavaScript-based logic.

They typically support dynamic styling, theming, responsive behavior handling, CSS preprocessing or polyfills, animation control, and runtime style updates to improve flexibility and cross-browser consistency.

⭐ Most Popular in 2026

The following chart shows the leading CSS JavaScript libraries in 2026, based on market share.

The most popular is Less.js with a share of 0.5%, followed by Emotion with 0.4% and Styled Components with 0.4%.

✨ Best CSS JavaScript Libraries

Below is a more detailed list of 10 CSS JavaScript libraries we detect, ranked by their market share.

Available filters: 2D-Graphics 3D-Graphics Animation Carousel CSS Data Grids DOM Editors Lightbox Scroll SPA State Utility UI
RankNameMarket share
1
Less.js

A JavaScript library that converts Less styles to CSS styles.

FreeOpen source
2
Emotion

A framework agnostic library designed for writing CSS styles with JavaScript.

FreeOpen source
3
Styled Components

A library for React that allows developers to write CSS directly in JS to style components.

FreeOpen source
4
Enquire.js

A lightweight, pure JavaScript library for responding to CSS media queries.

FreeOpen source
5
css-vars-ponyfill

Client-side support for CSS custom properties (aka "CSS variables") in legacy and modern browsers.

FreeOpen source
6
Critters
San Francisco, California, United States

A deprecated Webpack plugin that inlines your app's critical CSS and lazily loads the rest.

FreeOpen sourceLegacy
7
Animsition

A simple jQuery plugin for CSS animated page transitions.

FreeOpen source
8
Prefix-free

A legacy script that adds browser prefixes to CSS code when needed for old browsers.

FreeOpen sourceLegacy
9
Beasties
Edinburgh, United Kingdom

A plugin that inlines your app's critical CSS and lazy-loads the rest.

FreeOpen source
10
Motion UI
Campbell, California, United States

A Sass library for creating flexible CSS transitions and animations.

FreeOpen source

👉 See Also

Data is based on the analysis of 3,320,410 websites.
Statistics were last calculated on .
For details, see our methodology and disclaimer.