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IPerf3Client vs Ethr: catalog facts
IPerf3Client	Ethr
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the MIT licence.
Android	Windows, macOS, Linux, Command line
Supports TCP, UDP and SCTP over IPv4 and IPv6 Tunable timing, buffer and protocol settings	Covers TCP, UDP and ICMP in one tool Same tool on Windows, Linux and macOS
Needs an iPerf3 server to test against Small project with infrequent updates	Command-line only No formal releases listed on the repository
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	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 October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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