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

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