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M-Lab Speed Test vs nPerf: catalog facts
M-Lab Speed Test	nPerf
Free Free to use in the browser.	Free The web speed test is free to run.
Web	Windows, macOS, Android, iOS, Web
Reports retransmission as well as speed and latency Openly licensed measurement tools	Measures download, upload and latency Apps for mobile and desktop as well as the web
Your IP address is retained and published with the results Fewer extras than commercial speed tests	Not open source Tests against nPerf's own servers only
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.