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FortioSiege
Free

Free to use, with the source code published on GitHub.

 Free

Free and open source.

Web, Self-hosted, Command line macOS, Linux, Command line
  • Fixed queries-per-second load for repeatable tests
  • Latency histograms and detailed statistics
  • Tests many URLs at once from a list
  • Configurable number of simulated users
  • Aimed at developers and operators rather than casual users
  • Measures servers under load, not page rendering speed
  • Command line only, with no graphical reports
  • Scripting options are simpler than in newer load testers
Downloadable app, Self-hosted Downloadable app
Closed source Open source
License not stated License: GPL-3.0
No account needed No account needed
Works offline Works offline

Checked October 2, 2026

Checked September 24, 2026

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