Compare software

iPerf3 vs Speedtest CLI: catalog facts
iPerf3	Speedtest CLI
Free Free and open source under the BSD 3-Clause licence, developed at ESnet and Lawrence…	Free Free for personal, non-commercial use. Commercial use requires a licence.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, 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	Official client with results comparable to the web test JSON and CSV output suited to scheduled monitoring
Command line only Not backwards compatible with the original iperf	Closed source and licensed for non-commercial use by default Results depend on which Ookla server is selected
Downloadable app	Downloadable app
Open source	Closed source
License: BSD-3-Clause	License not stated
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.