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simplewall vs LuLu: catalog facts
simplewall	LuLu
Free Free and open source under the GPL 3.0.	Free The open-source software is available without a license fee. Hosting, hardware and…
Windows	macOS
A plain allow and block list rather than a stream of pop-ups Internal block list aimed at Windows telemetry	Provides an open-source firewall interface for network access decisions.
The project itself says it is for advanced users Not a Windows Firewall interface; it uses a separate rule system	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.