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NTttcp vs IPerf3Client: catalog facts
NTttcp	IPerf3Client
Free Free and open source.	Free Free and open source under the GPL-3.0 licence.
Windows, Command line	Android
Official Microsoft throughput tool Prebuilt binaries available	Supports TCP, UDP and SCTP over IPv4 and IPv6 Tunable timing, buffer and protocol settings
This repository targets Windows only Command-line only	Needs an iPerf3 server to test against Small project with infrequent updates
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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