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OpenSnitch vs Gufw: catalog facts
OpenSnitch	Gufw
Free Free and open source under the GPL.	Free Free and open source under the GPL-3.0 licence.
Linux	Linux
Prompts on every new outbound connection, so unexpected traffic becomes visible Blocks ad, tracker and malware domains system-wide	Manages ufw rules without the command line Uses PolicyKit for privileged actions
Linux only The first days are a stream of prompts until your rules settle	Linux only and depends on ufw being installed Small project with infrequent visible activity
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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