Compare software

Ethr vs Flent: catalog facts
Ethr	Flent
Free Free and open source under the MIT licence.	Free Free to download and use, with the source published on GitHub.
Windows, macOS, Linux, Command line	Linux, Command line
Covers TCP, UDP and ICMP in one tool Same tool on Windows, Linux and macOS	Repeatable aggregate tests built on netperf and iperf Interactive GUI and extensive plotting
Command-line only No formal releases listed on the repository	Needs netperf or iperf and a test server on the other end Aimed at technical users rather than a quick speed check
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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