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Little Snitch vs simplewall: catalog facts
Little Snitch	simplewall
Paid A one-time purchase is required after the demo period.	Free Free and open source under the GPL 3.0.
macOS	Windows
Per-application outbound rules with a clear prompt at the moment of connection Network monitor shows exactly which process is talking to where	A plain allow and block list rather than a stream of pop-ups Internal block list aimed at Windows telemetry
One-time paid licence, macOS only The initial flood of prompts takes patience to train	The project itself says it is for advanced users Not a Windows Firewall interface; it uses a separate rule system
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.