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Best customize theme plugins for WordPress

The most popular customize theme 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, ahead of WP Child Theme Generator (20K+) and WP Add Custom CSS and JS (20+). All 4 plugins tagged “customize theme” 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 4 customize theme plugins

  1. 1.
    Simple Custom CSS and JS

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

  2. 2.
    WP Child Theme Generator

    20K+ active installs. Rated 4.7 from 19 reviews, updated 1 month ago.

  3. 3.
    WP Add Custom CSS and JS

    20+ active installs. Only 1 review so far, updated 5 months ago. Tested only up to WordPress 6.8.12.

  4. 4.
    WP Smart Content

    10+ active installs. No reviews yet, updated 10 months ago. Tested only up to WordPress 6.9.11.

All 4 plugins tagged “customize theme”