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M-Lab Speed Test vs LibreSpeed: catalog facts
M-Lab Speed Test	LibreSpeed
Free Free to use in the browser.	Free Free and open source under the LGPL.
Web	Android, Web, Self-hosted
Reports retransmission as well as speed and latency Openly licensed measurement tools	Self-hosted, so the test measures your own path rather than a public server No plugins or heavy dependencies; it is plain JavaScript
Your IP address is retained and published with the results Fewer extras than commercial speed tests	Results depend entirely on where you host the server Fewer analytics than commercial speed test services
Web application	Web application, Self-hosted
Closed source	Open source
License not stated	License: LGPL-3.0
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.