Scrutoscope is a WordPress performance profiling plugin, the successor to P3 Profiler. It analyzes every hook callback during page requests, attributing time costs to plugins, themes, core, or other components. It highlights heavy queries and blocking HTTP calls. Reports are generated with full transparency, are 100% open source with no premium features, and can be viewed via an encrypted in-browser demo. It helps developers quickly identify and resolve site slowdowns.
In the Developer Tools space, Scrutoscope takes a focused approach. It focuses on diagnosing which plugins, hooks, queries, and external calls are causing performance bottlenecks in WordPress sites. It is built as a B2B product for wordPress developers and site owners. Scrutoscope is free to use. The product ships for the web and the command line, and it can be self-hosted.
Kurt Payne builds and maintains Scrutoscope, and the product first shipped in 2026. Development happens publicly on GitHub with 392 commits in the last 90 days. Key capabilities include hook profiling, plugin performance, and query analysis. The interface is available in English and Luxembourgish.
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