Compare software

sitespeed.ioDebugBear
Free

Free and open source with no sign-up.

 Freemium

The single speed test is free; monitoring is a paid service with a free trial.

Command line Web
  • Detailed reports with video, HAR waterfall and Core Web Vitals
  • Scripting for multi-step user journeys
  • Detailed load breakdown with a step-by-step filmstrip
  • Combines lab tests with real-user Core Web Vitals
  • Command-line setup takes more effort than an online checker
  • Long-term dashboards need your own Graphite or InfluxDB and Grafana
  • Free test runs from a limited set of locations
  • Continuous monitoring requires a paid plan
Downloadable app Web application, Hosted service
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

Checked September 23, 2026

Checked September 23, 2026

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