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Waveform Bufferbloat Test vs Flent: catalog facts
Waveform Bufferbloat Test	Flent
Free The test runs in the browser at no cost.	Free Free to download and use, with the source published on GitHub.
Web	Linux, Command line
Measures latency under load, not only raw speed Runs in the browser with nothing to install	Repeatable aggregate tests built on netperf and iperf Interactive GUI and extensive plotting
Hosted on a retailer's site Tests only the connection from the device running it	Needs netperf or iperf and a test server on the other end Aimed at technical users rather than a quick speed check
Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Needs internet	Works offline
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.