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iPerf 2 vs Ethr: catalog facts
iPerf 2	Ethr
Free Free to download from SourceForge.	Free Free and open source under the MIT licence.
Android, Command line	Windows, macOS, Linux, Command line
Measures latency, jitter and responsiveness as well as throughput Multicast, bidirectional and full-duplex testing	Covers TCP, UDP and ICMP in one tool Same tool on Windows, Linux and macOS
Command-line only on desktop Not wire-compatible with iperf3, which can cause confusion	Command-line only No formal releases listed on the repository
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MIT
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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