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OpenSpeedTest vs nuttcp: catalog facts
OpenSpeedTest	nuttcp
Free Free to use. Self-hosting is available under its own licence terms.	Free Free and open source.
Web, Self-hosted	Windows, macOS, Linux, Command line
Runs in any browser with no app or plugin Docker image makes internal LAN throughput testing trivial	Handles high-throughput TCP and UDP testing beyond typical consumer speed tests Cross-platform command-line tool suited to scripting and automation
Browser-based measurement caps out below what dedicated tools reach The hosted version's accuracy depends on server location	Requires installing and running the tool on both ends of the connection Command-line only, with a learning curve for new users
Web application, Self-hosted	Downloadable app
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.