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