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Unlighthouse vs sitespeed.io: catalog facts
Unlighthouse	sitespeed.io
Free Free and open source under the MIT licence, funded by sponsors.	Free Free and open source with no sign-up.
Command line	Command line
Audits a whole site rather than one page Automatic URL discovery and parallel scanning	Detailed reports with video, HAR waterfall and Core Web Vitals Scripting for multi-step user journeys
Requires Node 22 or later Large sites still take time to scan	Command-line setup takes more effort than an online checker Long-term dashboards need your own Graphite or InfluxDB and Grafana
Downloadable app	Downloadable app
Open source	Open source
License: MIT	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.