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