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nuttcpIPerf3Client
Free

Free and open source.

 Free

Free and open source under the GPL-3.0 licence.

Windows, macOS, Linux, Command line Android
  • Handles high-throughput TCP and UDP testing beyond typical consumer speed tests
  • Cross-platform command-line tool suited to scripting and automation
  • Supports TCP, UDP and SCTP over IPv4 and IPv6
  • Tunable timing, buffer and protocol settings
  • Requires installing and running the tool on both ends of the connection
  • Command-line only, with a learning curve for new users
  • Needs an iPerf3 server to test against
  • Small project with infrequent updates
Downloadable app Downloadable app
Open source Open source
License not stated License: GPL-3.0-or-later
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked October 2, 2026

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