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Yellow Lab Tools vs WebPageTest: catalog facts
Yellow Lab Tools	WebPageTest
Free Free and open source under the GPL-2.0 licence.	Freemium Basic tests are free, with paid options available.
Web, Self-hosted, Command line	Web
Checks front-end code quality as well as speed Detailed explanations of each issue	Detailed request waterfall and filmstrip view Tests from multiple locations
Development has slowed, with the last repository push in early 2024 Docker image is maintained by a third party	Output is detailed and assumes some performance knowledge Some features sit behind paid plans
Downloadable app, Web application, Self-hosted	Web application
Open source	Closed source
License: GPL-2.0	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.