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LuLu vs Radio Silence: catalog facts
LuLu	Radio Silence
Free The open-source software is available without a license fee. Hosting, hardware and…	Paid One-time price of $9 with a free trial and a 30-day money-back guarantee.
macOS	macOS
Provides an open-source firewall interface for network access decisions.	Blocks an app with a single click Shows background helpers and daemons that make connections
Blocking the wrong connection can interrupt an application's features.	macOS only Does not prompt about new connections, so blocking is manual
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
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 24, 2026

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