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iPerf3 vs iPerf 2: catalog facts
iPerf3	iPerf 2
Free Free and open source under the BSD 3-Clause licence, developed at ESnet and Lawrence…	Free Free to download from SourceForge.
Windows, macOS, Linux, Command line	Android, Command line
Measures the link between two machines you own, not a public server TCP, UDP and SCTP with tunable windows, streams and packet sizes	Measures latency, jitter and responsiveness as well as throughput Multicast, bidirectional and full-duplex testing
Command line only Not backwards compatible with the original iperf	Command-line only on desktop Not wire-compatible with iperf3, which can cause confusion
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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