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OpenSnitch vs firewalld: catalog facts
OpenSnitch	firewalld
Free Free and open source under the GPL.	Free Free and open source.
Linux	Linux, Command line
Prompts on every new outbound connection, so unexpected traffic becomes visible Blocks ad, tracker and malware domains system-wide	Zones set trust levels per connection or interface Changes apply without restarting the service
Linux only The first days are a stream of prompts until your rules settle	Linux only Zone concepts take some learning compared with plain rule lists
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License not stated
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 September 23, 2026

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