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nuttcp vs NTttcp: catalog facts
nuttcp	NTttcp
Free Free and open source.	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, Command line
Handles high-throughput TCP and UDP testing beyond typical consumer speed tests Cross-platform command-line tool suited to scripting and automation	Official Microsoft throughput tool Prebuilt binaries available
Requires installing and running the tool on both ends of the connection Command-line only, with a learning curve for new users	This repository targets Windows only Command-line only
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 24, 2026

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