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iPerf3 vs nuttcp: catalog facts
iPerf3	nuttcp
Free Free and open source under the BSD 3-Clause licence, developed at ESnet and Lawrence…	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, 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	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 Not backwards compatible with the original iperf	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: BSD-3-Clause	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 22, 2026

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