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