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Ostinato vs Tcpreplay: catalog facts
Ostinato	Tcpreplay
Paid Sold under several license tiers compared on the official site, with a web demo available.	Free Free and open source under the GPLv3.
Windows, macOS, Linux	Command line
Generates and replays custom L2/L3 traffic Runs on standard hardware, including a laptop	Replays captures at original timing, a set rate or line rate Rewrites addresses, ports, VLAN tags and checksums
Commercial licensing rather than a free download Aimed at network engineers; assumes protocol knowledge	Command-line only, with no graphical interface Requires existing packet captures to work from
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
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.