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Flent vs NTttcp: catalog facts
Flent	NTttcp
Free Free to download and use, with the source published on GitHub.	Free Free and open source.
Linux, Command line	Windows, Command line
Repeatable aggregate tests built on netperf and iperf Interactive GUI and extensive plotting	Official Microsoft throughput tool Prebuilt binaries available
Needs netperf or iperf and a test server on the other end Aimed at technical users rather than a quick speed check	This repository targets Windows only Command-line only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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