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OpenSpeedTest vs M-Lab Speed Test: catalog facts
OpenSpeedTest	M-Lab Speed Test
Free Free to use. Self-hosting is available under its own licence terms.	Free Free to use in the browser.
Web, Self-hosted	Web
Runs in any browser with no app or plugin Docker image makes internal LAN throughput testing trivial	Reports retransmission as well as speed and latency Openly licensed measurement tools
Browser-based measurement caps out below what dedicated tools reach The hosted version's accuracy depends on server location	Your IP address is retained and published with the results Fewer extras than commercial speed tests
Web application, Self-hosted	Web application
Open 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.