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iPerf 2 vs NTttcp: catalog facts
iPerf 2	NTttcp
Free Free to download from SourceForge.	Free Free and open source.
Android, Command line	Windows, Command line
Measures latency, jitter and responsiveness as well as throughput Multicast, bidirectional and full-duplex testing	Official Microsoft throughput tool Prebuilt binaries available
Command-line only on desktop Not wire-compatible with iperf3, which can cause confusion	This repository targets Windows only Command-line only
Downloadable app	Downloadable app
Open source	Open 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 24, 2026

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