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M-Lab Speed Test vs Speedtest by Ookla: catalog facts
M-Lab Speed Test	Speedtest by Ookla
Free Free to use in the browser.	Free Free on the web and in the desktop and mobile apps.
Web	Windows, macOS, Android, iOS, Web
Reports retransmission as well as speed and latency Openly licensed measurement tools	Works in a browser or in apps for most platforms Picks a nearby test server automatically
Your IP address is retained and published with the results Fewer extras than commercial speed tests	Closed source Site includes links to other Ookla services alongside the test
Web application	Downloadable app, Web application
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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