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firewalld vs OpenSnitch: catalog facts
firewalld	OpenSnitch
Free Free and open source.	Free Free and open source under the GPL.
Linux, Command line	Linux
Zones set trust levels per connection or interface Changes apply without restarting the service	Prompts on every new outbound connection, so unexpected traffic becomes visible Blocks ad, tracker and malware domains system-wide
Linux only Zone concepts take some learning compared with plain rule lists	Linux only The first days are a stream of prompts until your rules settle
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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