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nuttcp vs OpenSpeedTest: catalog facts
nuttcp	OpenSpeedTest
Free Free and open source.	Free Free to use. Self-hosting is available under its own licence terms.
Windows, macOS, Linux, Command line	Web, Self-hosted
Handles high-throughput TCP and UDP testing beyond typical consumer speed tests Cross-platform command-line tool suited to scripting and automation	Runs in any browser with no app or plugin Docker image makes internal LAN throughput testing trivial
Requires installing and running the tool on both ends of the connection Command-line only, with a learning curve for new users	Browser-based measurement caps out below what dedicated tools reach The hosted version's accuracy depends on server location
Downloadable app	Web application, Self-hosted
Open source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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