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PageSpeed Insights vs Yellow Lab Tools: catalog facts
PageSpeed Insights	Yellow Lab Tools
Free Free to use.	Free Free and open source under the GPL-2.0 licence.
Web	Web, Self-hosted, Command line
Field and lab data side by side Separate mobile and desktop results	Checks front-end code quality as well as speed Detailed explanations of each issue
Field data only appears for URLs with enough Chrome traffic Single-page checks rather than ongoing monitoring	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
No account 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.