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Windows Firewall Control vs OpenSnitch: catalog facts
Windows Firewall Control	OpenSnitch
Free Free to download and use.	Free Free and open source under the GPL.
Windows	Linux
Prompts when unknown programs try to connect out One-click switching between filtering modes	Prompts on every new outbound connection, so unexpected traffic becomes visible Blocks ad, tracker and malware domains system-wide
Windows only Medium filtering needs rules for every program you use	Linux only The first days are a stream of prompts until your rules settle
Downloadable app	Downloadable app
Closed 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 24, 2026	Official website Full listing and sources Checked September 21, 2026

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