Compare software

FlentiPerf3
Free

Free to download and use, with the source published on GitHub.

 Free

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

Linux, Command line Windows, macOS, Linux, Command line
  • Repeatable aggregate tests built on netperf and iperf
  • Interactive GUI and extensive plotting
  • Measures the link between two machines you own, not a public server
  • TCP, UDP and SCTP with tunable windows, streams and packet sizes
  • Needs netperf or iperf and a test server on the other end
  • Aimed at technical users rather than a quick speed check
  • 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
No account needed No account needed
Works offline Works offline

Checked September 23, 2026

Checked September 21, 2026

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