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nuttcp vs iPerf3: catalog facts
nuttcp	iPerf3
Free Free and open source.	Free Free and open source under the BSD 3-Clause licence, developed at ESnet and Lawrence…
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Handles high-throughput TCP and UDP testing beyond typical consumer speed tests Cross-platform command-line tool suited to scripting and automation	Measures the link between two machines you own, not a public server TCP, UDP and SCTP with tunable windows, streams and packet sizes
Requires installing and running the tool on both ends of the connection Command-line only, with a learning curve for new users	Command line only Not backwards compatible with the original iperf
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: BSD-3-Clause
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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