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OpenSnitch vs LuLu: catalog facts
OpenSnitch	LuLu
Free Free and open source under the GPL.	Free The open-source software is available without a license fee. Hosting, hardware and…
Linux	macOS
Prompts on every new outbound connection, so unexpected traffic becomes visible Blocks ad, tracker and malware domains system-wide	Provides an open-source firewall interface for network access decisions.
Linux only The first days are a stream of prompts until your rules settle	Blocking the wrong connection can interrupt an application's features.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
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.