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