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Yellow Lab Tools vs Uptrends Website Speed Test: catalog facts
Yellow Lab Tools	Uptrends Website Speed Test
Free Free and open source under the GPL-2.0 licence.	Freemium The speed test is free; Uptrends monitoring is a paid service with a 30-day trial.
Web, Self-hosted, Command line	Web
Checks front-end code quality as well as speed Detailed explanations of each issue	Choice of Chrome or Edge and of desktop or mobile Waterfall, filmstrip and Core Web Vitals in one report
Development has slowed, with the last repository push in early 2024 Docker image is maintained by a third party	Continuous monitoring requires a paid Uptrends plan The page promotes the commercial monitoring product
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.