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WebPageTest vs sitespeed.io: catalog facts
WebPageTest	sitespeed.io
Freemium Basic tests are free, with paid options available.	Free Free and open source with no sign-up.
Web	Command line
Detailed request waterfall and filmstrip view Tests from multiple locations	Detailed reports with video, HAR waterfall and Core Web Vitals Scripting for multi-step user journeys
Output is detailed and assumes some performance knowledge Some features sit behind paid plans	Command-line setup takes more effort than an online checker Long-term dashboards need your own Graphite or InfluxDB and Grafana
Web application	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is 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.