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iPerf 2 vs Flent: catalog facts
iPerf 2	Flent
Free Free to download from SourceForge.	Free Free to download and use, with the source published on GitHub.
Android, Command line	Linux, Command line
Measures latency, jitter and responsiveness as well as throughput Multicast, bidirectional and full-duplex testing	Repeatable aggregate tests built on netperf and iperf Interactive GUI and extensive plotting
Command-line only on desktop Not wire-compatible with iperf3, which can cause confusion	Needs netperf or iperf and a test server on the other end Aimed at technical users rather than a quick speed check
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.