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