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NTttcp vs nuttcp: catalog facts
NTttcp	nuttcp
Free Free and open source.	Free Free and open source.
Windows, Command line	Windows, macOS, Linux, Command line
Official Microsoft throughput tool Prebuilt binaries available	Handles high-throughput TCP and UDP testing beyond typical consumer speed tests Cross-platform command-line tool suited to scripting and automation
This repository targets Windows only Command-line only	Requires installing and running the tool on both ends of the connection Command-line only, with a learning curve for new users
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
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 September 22, 2026

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