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Tcpreplay vs Ostinato: catalog facts
Tcpreplay	Ostinato
Free Free and open source under the GPLv3.	Paid Sold under several license tiers compared on the official site, with a web demo available.
Command line	Windows, macOS, Linux
Replays captures at original timing, a set rate or line rate Rewrites addresses, ports, VLAN tags and checksums	Generates and replays custom L2/L3 traffic Runs on standard hardware, including a laptop
Command-line only, with no graphical interface Requires existing packet captures to work from	Commercial licensing rather than a free download Aimed at network engineers; assumes protocol knowledge
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	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.