Compare software

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

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