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Speedtest by Ookla vs M-Lab Speed Test: catalog facts
Speedtest by Ookla	M-Lab Speed Test
Free Free on the web and in the desktop and mobile apps.	Free Free to use in the browser.
Windows, macOS, Android, iOS, Web	Web
Works in a browser or in apps for most platforms Picks a nearby test server automatically	Reports retransmission as well as speed and latency Openly licensed measurement tools
Closed source Site includes links to other Ookla services alongside the test	Your IP address is retained and published with the results Fewer extras than commercial speed tests
Downloadable app, Web application	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.