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Ethr vs nuttcp: catalog facts
Ethr	nuttcp
Free Free and open source under the MIT licence.	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Covers TCP, UDP and ICMP in one tool Same tool on Windows, Linux and macOS	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 No formal releases listed on the repository	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: MIT	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 October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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