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