Compare software

sitespeed.ioSpeedCurve
Free

Free and open source with no sign-up.

 Paid

Commercial subscription service; demos are offered on request.

Command line Web
  • Detailed reports with video, HAR waterfall and Core Web Vitals
  • Scripting for multi-step user journeys
  • Synthetic testing and real user monitoring in one place
  • Tracks Core Web Vitals and custom timings over time
  • Command-line setup takes more effort than an online checker
  • Long-term dashboards need your own Graphite or InfluxDB and Grafana
  • Paid service aimed at businesses
  • More than an individual needs for occasional checks
Downloadable app Hosted service
Open source Closed source
License not stated License not stated
No account needed Account needed
Not stated if it works offline Needs internet

Checked September 23, 2026

Checked September 24, 2026

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