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nuttcp vs iPerf 2: catalog facts
nuttcp	iPerf 2
Free Free and open source.	Free Free to download from SourceForge.
Windows, macOS, Linux, Command line	Android, 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 latency, jitter and responsiveness as well as throughput Multicast, bidirectional and full-duplex testing
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 on desktop Not wire-compatible with iperf3, which can cause confusion
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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