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SiegePlow
Free

Free and open source.

 Free

Free and open source under the Apache 2.0 licence.

macOS, Linux, Command line Windows, Command line
  • Tests many URLs at once from a list
  • Configurable number of simulated users
  • Real-time metrics in both terminal and browser
  • Uses fasthttp for high request rates
  • Command line only, with no graphical reports
  • Scripting options are simpler than in newer load testers
  • 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: GPL-3.0 License: Apache-2.0
No account needed No account needed
Works offline Not stated if it works offline

Checked September 24, 2026

Checked October 2, 2026

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