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Little Snitch vs LuLu: catalog facts
Little Snitch	LuLu
Paid A one-time purchase is required after the demo period.	Free The open-source software is available without a license fee. Hosting, hardware and…
macOS	macOS
Per-application outbound rules with a clear prompt at the moment of connection Network monitor shows exactly which process is talking to where	Provides an open-source firewall interface for network access decisions.
One-time paid licence, macOS only The initial flood of prompts takes patience to train	Blocking the wrong connection can interrupt an application's features.
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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