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Ostinato vs Bit-Twist: catalog facts
Ostinato	Bit-Twist
Paid Sold under several license tiers compared on the official site, with a web demo available.	Free Free and open source under GPL-2.0-or-later.
Windows, macOS, Linux	Windows, macOS, Linux, Command line
Generates and replays custom L2/L3 traffic Runs on standard hardware, including a laptop	Replays and edits captured PCAP traffic Can generate packets from built-in templates
Commercial licensing rather than a free download Aimed at network engineers; assumes protocol knowledge	Windows builds require Npcap
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0-or-later
Not stated if an account is needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 8, 2026

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