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Speedtest CLIiPerf3
Free

Free for personal, non-commercial use. Commercial use requires a licence.

 Free

Free and open source under the BSD 3-Clause licence, developed at ESnet and Lawrence…

Windows, macOS, Linux, Command line Windows, macOS, Linux, Command line
  • Official client with results comparable to the web test
  • JSON and CSV output suited to scheduled monitoring
  • Measures the link between two machines you own, not a public server
  • TCP, UDP and SCTP with tunable windows, streams and packet sizes
  • Closed source and licensed for non-commercial use by default
  • Results depend on which Ookla server is selected
  • Command line only
  • Not backwards compatible with the original iperf
Downloadable app Downloadable app
Closed source Open source
License not stated License: BSD-3-Clause
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 22, 2026

Checked September 21, 2026

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