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nuttcp vs LibreSpeed: catalog facts
nuttcp	LibreSpeed
Free Free and open source.	Free Free and open source under the LGPL.
Windows, macOS, Linux, Command line	Android, 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	Self-hosted, so the test measures your own path rather than a public server No plugins or heavy dependencies; it is plain JavaScript
Requires installing and running the tool on both ends of the connection Command-line only, with a learning curve for new users	Results depend entirely on where you host the server Fewer analytics than commercial speed test services
Downloadable app	Web application, Self-hosted
Open source	Open source
License not stated	License: LGPL-3.0
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.