Compare software

Grafana k6Loadster
Free

The k6 tool itself is free and open source.

 Freemium

Free to start testing, with paid plans for larger tests.

Command line Web
  • Test scenarios written in plain JavaScript
  • Single command-line tool, also usable in Docker
  • Choice of real browsers, HTTP bots or Playwright scripts
  • Runs from 32 cloud regions
  • Requires writing scripts; no graphical test builder in the tool itself
  • Aimed at developers rather than casual site owners
  • Cloud service only, not self-hostable
  • Large tests require a paid plan
Downloadable app Hosted service
Open source Closed source
License not stated License not stated
No account needed Account needed
Works offline Needs internet

Checked September 23, 2026

Checked October 2, 2026

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