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WebPageTest vs ByteCheck: catalog facts
WebPageTest	ByteCheck
Freemium Basic tests are free, with paid options available.	Free Free to use online.
Web	Web
Detailed request waterfall and filmstrip view Tests from multiple locations	Focused TTFB measurement Quick and repeatable
Output is detailed and assumes some performance knowledge Some features sit behind paid plans	Measures server response only, not full page load Only tests publicly reachable URLs
Web application	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.