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Yellow Lab Tools vs sitespeed.io: catalog facts
Yellow Lab Tools	sitespeed.io
Free Free and open source under the GPL-2.0 licence.	Free Free and open source with no sign-up.
Web, Self-hosted, Command line	Command line
Checks front-end code quality as well as speed Detailed explanations of each issue	Detailed reports with video, HAR waterfall and Core Web Vitals Scripting for multi-step user journeys
Development has slowed, with the last repository push in early 2024 Docker image is maintained by a third party	Command-line setup takes more effort than an online checker Long-term dashboards need your own Graphite or InfluxDB and Grafana
Downloadable app, Web application, Self-hosted	Downloadable app
Open source	Open source
License: GPL-2.0	License not stated
No account needed	No account needed
Not stated if it works offline	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.