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Best site CSS plugins for WordPress

The most popular site CSS plugins for WordPress in November 2026, in WordPress.org’s own popular order, which follows active installs. Simple Custom CSS and JS leads with 600K+ active installs. All 1 plugins tagged “site css” are below, with figures from WordPress.org that update every day.

Installs aren’t everything: a recent release, a “Tested up to” that matches the current WordPress, and support threads that get resolved show a plugin is looked after. Open any plugin for its downloads, rank history and alternatives.

Research this niche or see all plugins.

Top 1 site CSS plugins

  1. 1.
    Simple Custom CSS and JS

    The most installed site CSS plugin, with 600K+ active installs. Rated 4.4 from 104 reviews, updated 6 days ago.

All 1 plugins tagged “site css”