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

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