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