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GTmetrix vs sitespeed.io: catalog facts
GTmetrix	sitespeed.io
Freemium Free tests and a free account, with paid plans for more features.	Free Free and open source with no sign-up.
Web	Command line
Test locations in 25 regions Configurable connection speed, user agent and cookies	Detailed reports with video, HAR waterfall and Core Web Vitals Scripting for multi-step user journeys
Many options and locations require an account or paid plan	Command-line setup takes more effort than an online checker Long-term dashboards need your own Graphite or InfluxDB and Grafana
Web application, Hosted service	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.