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iPerf3Flowgrind
Free

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

 Free

Free and open source under GPL-3.0-or-later.

Windows, macOS, Linux, Command line macOS, Linux, Command line
  • Measures the link between two machines you own, not a public server
  • TCP, UDP and SCTP with tunable windows, streams and packet sizes
  • Measures several TCP performance metrics
  • Supports distributed tests between arbitrary endpoints
  • Command line only
  • Not backwards compatible with the original iperf
  • Supports Linux, FreeBSD and Mac OS X only
  • Requires libxmlrpc-c
Downloadable app Downloadable app
Open source Open source
License: BSD-3-Clause License: GPL-3.0-or-later
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked October 8, 2026

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