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