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