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M-Lab Speed Test vs Speedtest CLI: catalog facts
M-Lab Speed Test	Speedtest CLI
Free Free to use in the browser.	Free Free for personal, non-commercial use. Commercial use requires a licence.
Web	Windows, macOS, Linux, Command line
Reports retransmission as well as speed and latency Openly licensed measurement tools	Official client with results comparable to the web test JSON and CSV output suited to scheduled monitoring
Your IP address is retained and published with the results Fewer extras than commercial speed tests	Closed source and licensed for non-commercial use by default Results depend on which Ookla server is selected
Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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