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iPerf 2nuttcp
Free

Free to download from SourceForge.

 Free

Free and open source.

Android, Command line Windows, macOS, Linux, Command line
  • Measures latency, jitter and responsiveness as well as throughput
  • Multicast, bidirectional and full-duplex testing
  • Handles high-throughput TCP and UDP testing beyond typical consumer speed tests
  • Cross-platform command-line tool suited to scripting and automation
  • Command-line only on desktop
  • Not wire-compatible with iperf3, which can cause confusion
  • Requires installing and running the tool on both ends of the connection
  • Command-line only, with a learning curve for new users
Downloadable app Downloadable app
Open source Open source
License not stated License not stated
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 1, 2026

Checked September 22, 2026

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