by John Blackbourn 4.9 (470 reviews)

Query Monitor

Name: Query Monitor
Rating: 4.9 (470 reviews)
Author: John Blackbourn

Query Monitor is the developer tools panel for WordPress and WooCommerce.

Query Monitor ranks #241 among WordPress.org plugins with 200,000+ active installations, is #38 of 5,058 in the Security category, a 4.9/5 rating from 470 reviews, and was last updated Oct 27, 2026. Data from WordPress.org, refreshed twice daily — see methodology.

Compatible with WP 7.1.4

v4.1.1 Current Version v4.1.1

Updated 5 days ago Last Update on 27 Oct, 2026

Refreshed 18 hours ago Last Refreshed on

#38 of 5,058 in Security Top 1% by installs Downloads +146.1% this week Actively maintained

View on WordPress.org

Rank

#241

— No change

Active Installs

200K+

-21.8%

KW Avg Position

24.6

0.2 worse

Downloads

22.4M

+4,796 today

Support Resolved

— No change

Rating

98%

Review 4.9 out of 5

4.9 (470 reviews)

Next Milestone 300K

Total Progress 50%

200K+ 300K+

Ranks to Climb

Growth Needed

8,000,000

Active Installs

Pro

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Rank Changes

Current #241

Change

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Active Installs Growth

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Active Installs 0,000,000+

Growth +0.0%

Peak 0,000,000

Downloads Growth

Downloads

Growth

Peak

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Reviews & Ratings

4.9

470 reviews

Overall 98%

455 (97%)

3 (1%)

2 (0%)

0 (0%)

10 (2%)

Support Threads Overview

Resolved

Unresolved

Total Threads

Resolved

Unresolved

Resolution Rate

Security History

Source: WPVulnerability

1 known vulnerability on record · 1 in the last 24 months · checked 1 week ago

Mar 30, 2026

Query Monitor [query-monitor] < 3.20.4

CVE-2026-4267 · Fixed in v3.20.4

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Plugin Details

Version: 4.1.1
Last Updated: Oct 27, 2026
Requires WP: 6.3+
Tested Up To: 7.1.4
PHP Version: 7.4 or higher
Author: John Blackbourn

Support & Rating

Rating: ★ ★ ★ ★ ★ 4.9
Reviews: 470
Support Threads: 3
Resolved: 0%

Keywords

debug debug bar development performance query monitor

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TL;DR

AI summary of the plugin's readme

Query Monitor is for WordPress and WooCommerce developers who need to debug and profile their site. It reveals database queries, PHP errors, hooks, HTTP requests, and other backend activity to help identify poorly performing plugins, themes, or functions.

Database query debugging
PHP error reporting
Hooks and actions debugging
Block editor blocks debugging
Enqueued scripts and stylesheets
HTTP API call debugging
REST API call debugging
User capability checks

Frequently Asked Questions

Common questions about Query Monitor

Yes, it's actively tested and working up to PHP 8.5.

By default, Query Monitor's output is only shown to Administrators on single-site installations, and Super Admins on Multisite installations. In addition to this, you can set an authentication cookie which allows you to view Query Monitor output when you're not logged in, or when you're logged in as a user who cannot usually see Query Monitor's output. See the Settings panel for details.

Short answer: Yes, but only a little. Long answer: Query Monitor has a small impact on page generation time because it hooks into a few places in WordPress in the same way that other plugins do. The impact is negligible. On pages that have an especially high number of database queries (in the hundreds), Query Monitor currently uses more memory than I would like it to. This is due to the amount of data that is captured in the stack trace for each query. I have been and will be working to continually reduce this.

Yes, you can call do_action( 'qm/cease' ) to instruct Query Monitor to cease operating for the remainder of the page generation. It will detach itself from further data collection, discard any data it's collected so far, and skip the output of its information. This is useful for long-running operations that perform a very high number of database queries, consume a lot of memory, or otherwise are of no concern to Query Monitor, for example: Backing up or restoring your site Importing or exporting a large amount of data Running security scans

A list of add-on plugins for Query Monitor can be found here. In addition, Query Monitor transparently supports add-ons for the Debug Bar plugin. If you have any Debug Bar add-ons installed, deactivate Debug Bar and the add-ons will show up in Query Monitor's menu.

Please use the issue tracker on Query Monitor's GitHub repo as it's easier to keep track of issues there, rather than on the wordpress.org support forums.

Some web hosts bundle Query Monitor as part of their hosting platform, which means you don't need to install it yourself. Here are some that I'm aware of: Altis Cloud. WordPress VIP, although users need to be granted the view_query_monitor capability even if they're an Administrator. See the WordPress VIP documentation for details.

Yes. You can enable this on the Settings panel.

You can submit a private security vulnerability report to Query Monitor via the Security tab on the GitHub repo. The GitHub Security Advisory process facilitates private collaboration on security issues. You'll receive credit for a valid report and a CVE if necessary.

I am accepting sponsorships via the GitHub Sponsors program. If you work at an agency that develops with WordPress, ask your company to provide sponsorship in order to invest in its supply chain. The tools that I maintain probably save your company time and money, and GitHub sponsorship can now be done at the organisation level. In addition, if you like the plugin then I'd love for you to leave a review. Tell all your friends about it too!