⚡ CSS Tools in the United States

CSS tools are software applications and libraries for processing CSS (Cascading Style Sheets), including static code analysis, transformation, cleanup, and more.

The United States of America (USA) is a North American country with a population of over 341 million people.

According to our research, CSS tools are used on 0.9% of websites from the United States.

⭐ Most Popular in 2026

The following chart shows the top CSS tools in the United States in 2026, based on market share.

The most popular is RTLCSS with an impressive share of 56.4%, followed by PostCSS with 53.6% and Autoprefixer with 33.1%.

RTLCSS 56.4%
PostCSS 53.6%
Autoprefixer 33.1%
Stylelint 3.2%
Custom Shape Dividers 1.1%
PurgeCSS 0.7%
Animista 0.4%
CSSLint 0.04%

✨ Best CSS Tools

Below is a more detailed list of 8 CSS tools used on sites from the United States, ranked by their market share.

Rank	Name	Market share
1	RTLCSS Jordan A framework for converting Left-To-Right CSS to Right-To-Left. FreeOpen source	56.4%
2	PostCSS A tool for transforming CSS styles with JS plugins. FreeOpen source	53.6%
3	Autoprefixer A PostCSS plugin to parse CSS and add vendor prefixes to CSS rules using values from Can I Use. FreeOpen source	33.1%
4	Stylelint A linter for CSS and SCSS stylesheets that helps to avoid errors and enforce conventions. FreeOpen source	3.2%
5	Custom Shape Dividers An online tool to generate fully responsive CSS dividers.	1.1%
6	PurgeCSS A tool to analyze and remove unused CSS. FreeOpen source	0.7%
7	Animista A CSS animation library of ready-made CSS animations.	0.4%
8	CSSLint An open-source code quality tool for static analysis of CSS code.	0.04%

👉 See Also

✨ Related Technologies
- CSS
🌎 CSS Tools in other countries

Data is based on the analysis of 545,779 websites from the United States.
Statistics were last calculated on March 21, 2026.
For details, see our methodology and disclaimer.