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Ostinato vs Packet Sender: catalog facts
Ostinato	Packet Sender
Paid Sold under several license tiers compared on the official site, with a web demo available.	Free Free and open source, with no ads or bundled software.
Windows, macOS, Linux	Windows, macOS, Linux, Command line
Generates and replays custom L2/L3 traffic Runs on standard hardware, including a laptop	Sends and receives TCP, UDP, SSL and DTLS Command-line tool for scripted tests
Commercial licensing rather than a free download Aimed at network engineers; assumes protocol knowledge	Low-level tool that assumes some networking knowledge Panel generator is aimed at control systems, a niche use
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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