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FAST.com vs M-Lab Speed Test: catalog facts
FAST.com	M-Lab Speed Test
Free Free to use in the browser.	Free Free to use in the browser.
Web	Web
Very simple, gives a download figure quickly Shows loaded and unloaded latency on request	Reports retransmission as well as speed and latency Openly licensed measurement tools
Upload and latency are hidden by default No jitter or packet loss measurement	Your IP address is retained and published with the results Fewer extras than commercial speed tests
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is 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.