Compare software

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

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