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Yellow Lab Tools vs PageSpeed Insights: catalog facts
Yellow Lab Tools	PageSpeed Insights
Free Free and open source under the GPL-2.0 licence.	Free Free to use.
Web, Self-hosted, Command line	Web
Checks front-end code quality as well as speed Detailed explanations of each issue	Field and lab data side by side Separate mobile and desktop results
Development has slowed, with the last repository push in early 2024 Docker image is maintained by a third party	Field data only appears for URLs with enough Chrome traffic Single-page checks rather than ongoing monitoring
Downloadable app, Web application, Self-hosted	Web application
Open source	Closed source
License: GPL-2.0	License not stated
No account needed	No account 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.