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LibreSpeed vs iPerf3: catalog facts
LibreSpeed	iPerf3
Free Free and open source under the LGPL.	Free Free and open source under the BSD 3-Clause licence, developed at ESnet and Lawrence…
Android, Web, Self-hosted	Windows, macOS, Linux, Command line
Self-hosted, so the test measures your own path rather than a public server No plugins or heavy dependencies; it is plain JavaScript	Measures the link between two machines you own, not a public server TCP, UDP and SCTP with tunable windows, streams and packet sizes
Results depend entirely on where you host the server Fewer analytics than commercial speed test services	Command line only Not backwards compatible with the original iperf
Web application, Self-hosted	Downloadable app
Open source	Open source
License: LGPL-3.0	License: BSD-3-Clause
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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