WordPress Debug Plugins Compared: Which One Do You Actually Need?

WordPress has a handful of plugins that help developers and site owners read error logs, inspect queries, monitor performance, and debug JavaScript — but they don’t all do the same thing. Picking the right one depends on what you’re trying to diagnose. This guide compares the most commonly used WordPress debugging plugins honestly, so you can choose the right tool for your situation rather than installing every one of them.

Logmate: Error Log Viewer with JS Error Capture

Logmate is focused on making your WordPress error log accessible and actionable from inside the dashboard. It reads your PHP debug log — the file that captures PHP fatal errors, warnings, notices, and deprecated function calls — and presents it as a structured, searchable table with occurrence counts, source file references, and last-occurrence timestamps. No FTP, no file manager, no scrolling through raw text.

What sets Logmate apart from other debug plugins is JavaScript error capture. Browser-side JS errors from real visitor sessions are recorded server-side and displayed in the same interface alongside PHP errors. This matters because WordPress JavaScript errors — broken interactive elements, failed form submissions, jQuery conflicts — are completely invisible in the PHP debug log.

Logmate also handles log retention (auto-purge after N days), log export, SCRIPT_DEBUG toggling from the dashboard, and a System Info screen showing PHP version, WordPress version, database details, active theme, and all active plugins. It’s free.

Best for: site owners and developers who want to monitor PHP and JS errors from inside the WordPress dashboard without server access.

Query Monitor: Database and Request Inspector

Query Monitor is a developer-focused diagnostic tool that shows database queries, hooks, conditionals, HTTP API calls, and script/style enqueue information for each page load. It’s exceptionally useful for performance debugging and theme/plugin development — finding slow queries, identifying which plugin is adding excessive database calls, or checking which hooks are firing on a given page.

What it doesn’t do: it doesn’t read your PHP debug log file, doesn’t capture JS errors from visitor sessions, and doesn’t provide log retention or export. It’s a real-time inspector for the current page request rather than an error logging system. The two tools are genuinely complementary — Logmate for persistent error capture and log access; Query Monitor for real-time request inspection during development.

Best for: active development and performance debugging where you’re watching what happens during a specific page load.

WP Debugging: Simple WP_DEBUG Toggle

WP Debugging is a minimal plugin that toggles WP_DEBUG, WP_DEBUG_LOG, and WP_DEBUG_DISPLAY from the WordPress admin without requiring manual edits to wp-config.php. It doesn’t display log contents in the dashboard, doesn’t capture JS errors, and doesn’t provide any analysis — it just makes enabling and disabling the PHP debugging constants easier.

Logmate overlaps with this use case through its SCRIPT_DEBUG toggle and, more relevantly, by reading the log once it’s enabled. If you already use Logmate, WP Debugging adds nothing on top of it.

Best for: developers who frequently toggle debug mode during local development and want to avoid touching wp-config.php repeatedly.

Debug Bar: Admin Bar Debug Panel

Debug Bar adds a debug panel to the WordPress admin bar showing PHP warnings and notices for the current page load, database queries, and the number of queries and execution time. It’s an older tool and less comprehensive than Query Monitor, which has largely superseded it for development use. Like Query Monitor, it’s a real-time inspector rather than a persistent logging system.

Best for: developers already accustomed to it or those on older setups. For new setups, Query Monitor is the more capable alternative in the same category.

At a Glance: Which Plugin Does What

Feature	Logmate	Query Monitor	WP Debugging	Debug Bar
PHP error log viewer	Yes	Current page only	No	Current page only
JS error capture (all visitors)	Yes	No	No	No
Log export	Yes	No	No	No
Log retention/purge	Yes	No	No	No
SCRIPT_DEBUG toggle	Yes	No	No	No
System info screen	Yes	Partial	No	No
Database query inspector	No	Yes	No	Basic
Hook/conditional inspector	No	Yes	No	No
HTTP API call inspector	No	Yes	No	No

Frequently Asked Questions

Can I use Logmate and Query Monitor together?

Yes, and this is the recommended setup for active WordPress development. They cover different ground: Logmate handles persistent PHP and JS error logging from all visitor sessions, while Query Monitor inspects real-time request data during your own debugging sessions. They don’t conflict and work well alongside each other.

Should I leave debug plugins active on a live site?

Logmate is designed to run on production sites safely — it reads your existing debug log without exposing any error output to visitors. Query Monitor and Debug Bar should generally be deactivated on production because they add overhead to every page request and their real-time inspection data isn’t useful outside of active debugging. Logmate’s auto-refresh and log retention make it practical as a permanent monitoring tool rather than a debugging-session tool.

Is Logmate a good alternative to Query Monitor?

They solve different problems, so “alternative” isn’t the right framing. If you need database query inspection and hook tracing for active development, Query Monitor is the right tool and Logmate doesn’t replace it. If you need persistent error log visibility and JS error capture for production monitoring, Logmate is the right tool and Query Monitor doesn’t replace it either.

---

The WordPress debug plugin ecosystem covers different needs. For persistent PHP and JavaScript error logging from the dashboard — the kind of visibility that runs silently in production and tells you what’s actually breaking on your live site — Logmate is the tool for that job.

You might also like:

• How to View WordPress Error Logs (Every Method Explained)
• WordPress JavaScript Errors: What Breaks Your Site and How to Find Them
• How to Debug WordPress Without FTP or Server Access