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Grafana k6Plow
Free

The k6 tool itself is free and open source.

 Free

Free and open source under the Apache 2.0 licence.

Command line Windows, Command line
  • Test scenarios written in plain JavaScript
  • Single command-line tool, also usable in Docker
  • Real-time metrics in both terminal and browser
  • Uses fasthttp for high request rates
  • Requires writing scripts; no graphical test builder in the tool itself
  • Aimed at developers rather than casual site owners
  • Tests HTTP endpoints only
  • Should only be pointed at servers you are allowed to load test
Downloadable app Downloadable app
Open source Open source
License not stated License: Apache-2.0
No account needed No account needed
Works offline Not stated if it works offline

Checked September 23, 2026

Checked October 2, 2026

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