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FlowgrindiPerf3
Free

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

 Free

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

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

Checked October 8, 2026

Checked September 21, 2026

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