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Best diagnostics plugins for WordPress

The most popular diagnostics plugins for WordPress in November 2026, in WordPress.org’s own popular order, which follows active installs. Performance Lab leads with 100K+ active installs, ahead of Server Info (3K+) and Show IP Address (900+). All 118 plugins tagged “diagnostics” 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 10 diagnostics plugins

  1. 1.
    Performance Lab

    The most installed diagnostics plugin, with 100K+ active installs. Rated 4.3 from 51 reviews, updated 2 months ago.

  2. 2.
    Server Info

    3K+ active installs. Rated 3.8 from 12 reviews, updated 2 weeks ago.

  3. 3.
    Show IP Address

    900+ active installs. Rated 5.0 from 5 reviews, updated 5 days ago.

  4. 4.
    Commerza for WooCommerce

    90+ active installs. No reviews yet, updated 8 months ago. Tested only up to WordPress 6.9.11.

  5. 5.
    Multisite Usage Scanner

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

  6. 6.
    atec 404 Tracker

    50+ active installs. Only 2 reviews so far, updated 4 months ago.

  7. 7.
    Zibal Advanced Connection Checker

    40+ active installs. No reviews yet, updated 4 months ago.

  8. 8.
    SiteHale

    20+ active installs. Only 1 review so far, updated 2 weeks ago.

  9. 9.
    Kelpiks FormProof

    20+ active installs. No reviews yet, updated 3 months ago.

  10. 10.
    NPC Maintenance Inspector

    20+ active installs. No reviews yet, updated 2 weeks ago.

All 118 plugins tagged “diagnostics”