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OpenSnitch vs GlassWire: catalog facts
OpenSnitch	GlassWire
Free Free and open source under the GPL.	Freemium A free version is available. Longer history and extra features require a paid licence.
Linux	Windows, Android
Prompts on every new outbound connection, so unexpected traffic becomes visible Blocks ad, tracker and malware domains system-wide	Visual history makes it obvious which application started talking and when Alerts on first connections and on changes to system network settings
Linux only The first days are a stream of prompts until your rules settle	Longer history retention and several features need a paid licence Windows and Android only, closed source
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 22, 2026

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