Best compat plugins for WordPress
The most popular compat plugins for WordPress in November 2026, in WordPress.org’s own popular order, which follows active installs. PHP Compatibility Checker leads with 200K+ active installs, ahead of Sullivan Compatibility Plugin (100+). All 2 plugins tagged “compat” 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 2 compat plugins
- 1.
PHP Compatibility CheckerThe most installed compat plugin, with 200K+ active installs. Rated 2.7 from 131 reviews, updated 3 months ago. Tested only up to WordPress 6.4.14.
- 2.
Sullivan Compatibility Plugin100+ active installs. No reviews yet, last updated 8 years ago. Tested only up to WordPress 4.8.34.
All 2 plugins tagged “compat”
PHP Compatibility Checker
Up in the last 7 days:2#266by WP Engine3 months ago
Make sure your plugins and themes are compatible with newer PHP versions.
- Installs
- 200K+
- Rating
- 2.7(131)
- Downloads
- 454/day
Sullivan Compatibility Plugin
Up in the last 7 days:57#15,218by Anders Norén8 years ago
Compatibility plugin for the WordPress theme Sullivan (sullivan).
- Installs
- 100+
- Rating
- –
- Downloads
- 0/day