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Speedtest CLI vs M-Lab Speed Test: catalog facts
Speedtest CLI	M-Lab Speed Test
Free Free for personal, non-commercial use. Commercial use requires a licence.	Free Free to use in the browser.
Windows, macOS, Linux, Command line	Web
Official client with results comparable to the web test JSON and CSV output suited to scheduled monitoring	Reports retransmission as well as speed and latency Openly licensed measurement tools
Closed source and licensed for non-commercial use by default Results depend on which Ookla server is selected	Your IP address is retained and published with the results Fewer extras than commercial speed tests
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.