Compare software

WebPageTest vs Yellow Lab Tools: catalog facts
WebPageTest	Yellow Lab Tools
Freemium Basic tests are free, with paid options available.	Free Free and open source under the GPL-2.0 licence.
Web	Web, Self-hosted, Command line
Detailed request waterfall and filmstrip view Tests from multiple locations	Checks front-end code quality as well as speed Detailed explanations of each issue
Output is detailed and assumes some performance knowledge Some features sit behind paid plans	Development has slowed, with the last repository push in early 2024 Docker image is maintained by a third party
Web application	Downloadable app, Web application, Self-hosted
Closed source	Open source
License not stated	License: GPL-2.0
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.