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Yellow Lab Tools vs DebugBear: catalog facts
Yellow Lab Tools	DebugBear
Free Free and open source under the GPL-2.0 licence.	Freemium The single speed test is free; monitoring is a paid service with a free trial.
Web, Self-hosted, Command line	Web
Checks front-end code quality as well as speed Detailed explanations of each issue	Detailed load breakdown with a step-by-step filmstrip Combines lab tests with real-user Core Web Vitals
Development has slowed, with the last repository push in early 2024 Docker image is maintained by a third party	Free test runs from a limited set of locations Continuous monitoring requires a paid plan
Downloadable app, Web application, Self-hosted	Web application, Hosted service
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.