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Speedtest CLI vs nPerf: catalog facts
Speedtest CLI	nPerf
Free Free for personal, non-commercial use. Commercial use requires a licence.	Free The web speed test is free to run.
Windows, macOS, Linux, Command line	Windows, macOS, Android, iOS, Web
Official client with results comparable to the web test JSON and CSV output suited to scheduled monitoring	Measures download, upload and latency Apps for mobile and desktop as well as the web
Closed source and licensed for non-commercial use by default Results depend on which Ookla server is selected	Not open source Tests against nPerf's own servers only
Downloadable app	Downloadable app, Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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