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nuttcp vs Ethr: catalog facts
nuttcp	Ethr
Free Free and open source.	Free Free and open source under the MIT licence.
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	Covers TCP, UDP and ICMP in one tool Same tool on Windows, Linux and macOS
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 No formal releases listed on the repository
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MIT
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 October 2, 2026

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