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NTttcp vs Flent: catalog facts
NTttcp	Flent
Free Free and open source.	Free Free to download and use, with the source published on GitHub.
Windows, Command line	Linux, Command line
Official Microsoft throughput tool Prebuilt binaries available	Repeatable aggregate tests built on netperf and iperf Interactive GUI and extensive plotting
This repository targets Windows only Command-line only	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 not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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