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SpeedCurve vs sitespeed.io: catalog facts
SpeedCurve	sitespeed.io
Paid Commercial subscription service; demos are offered on request.	Free Free and open source with no sign-up.
Web	Command line
Synthetic testing and real user monitoring in one place Tracks Core Web Vitals and custom timings over time	Detailed reports with video, HAR waterfall and Core Web Vitals Scripting for multi-step user journeys
Paid service aimed at businesses More than an individual needs for occasional checks	Command-line setup takes more effort than an online checker Long-term dashboards need your own Graphite or InfluxDB and Grafana
Hosted service	Downloadable app
Closed source	Open source
License not stated	License not stated
Account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.