Yes, CSS is free to use. It is available as a free plugin on WordPress.org.

How many websites use CSS?

CSS has 500 active installations as tracked by WordPress.org.

What are the best CSS alternatives?

Popular alternatives to CSS include WPCode – Insert Headers and Footers +…, Code Snippets, Simple Custom CSS Plugin. You can compare them side-by-side on our comparison pages.

Does CSS work with the latest WordPress?

CSS has been tested up to WordPress 3.4.2. It requires WordPress 3.4+ and PHP false+.

PluginSift

CSS

Name: CSS
Rating: 3 (2 reviews)
Author: koopersmith

A simple custom CSS plugin for themes that integrates with the new theme customizer.

By koopersmith·CSS·Free

3(2 reviews)

·500 active installs·Updated 8 years ago

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As of April 2026, CSS is a WordPress css plugin with 500 active installations and a 3/5 rating from 2 reviews. It has been downloaded 36K+ times in total. Requires WordPress 3.4+ and PHP false+. Available on WordPress.org since 2012. Last updated 8 years ago — may have compatibility concerns. Top alternative: WPCode – Insert Headers and Footers +….