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Best custom functions plugins for WordPress

The most popular custom functions plugins for WordPress in November 2026, in WordPress.org’s own popular order, which follows active installs. WP Missing Functions Plugin leads with 10+ active installs. All 1 plugins tagged “custom functions plugin” 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 custom functions plugins

  1. 1.
    WP Missing Functions Plugin

    The most installed custom functions plugin, with 10+ active installs. Only 2 reviews so far, last updated 11 years ago. Tested only up to WordPress 4.2.39.

All 1 plugins tagged “custom functions plugin”