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iPerf3OpenSpeedTest
Free

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

 Free

Free to use. Self-hosting is available under its own licence terms.

Windows, macOS, Linux, Command line Web, Self-hosted
  • Measures the link between two machines you own, not a public server
  • TCP, UDP and SCTP with tunable windows, streams and packet sizes
  • Runs in any browser with no app or plugin
  • Docker image makes internal LAN throughput testing trivial
  • Command line only
  • Not backwards compatible with the original iperf
  • Browser-based measurement caps out below what dedicated tools reach
  • The hosted version's accuracy depends on server location
Downloadable app Web application, Self-hosted
Open source Open source
License: BSD-3-Clause License not stated
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked September 22, 2026

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