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GTmetrix vs ByteCheck: catalog facts
GTmetrix	ByteCheck
Freemium Free tests and a free account, with paid plans for more features.	Free Free to use online.
Web	Web
Test locations in 25 regions Configurable connection speed, user agent and cookies	Focused TTFB measurement Quick and repeatable
Many options and locations require an account or paid plan	Measures server response only, not full page load Only tests publicly reachable URLs
Web application, Hosted service	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	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.