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Radio Silence vs Lockdown Privacy: catalog facts
Radio Silence	Lockdown Privacy
Paid One-time price of $9 with a free trial and a 30-day money-back guarantee.	Freemium Free tier available; premium tier unlocks more filtering options.
macOS	macOS, iOS
Blocks an app with a single click Shows background helpers and daemons that make connections	Blocking happens on-device instead of through a third-party VPN server Open source, so its blocking behavior can be independently verified
macOS only Does not prompt about new connections, so blocking is manual	Advanced features require the paid tier Only covers what its firewall rules recognize
Downloadable app	Downloadable app
Closed source	Open source
License not stated	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 24, 2026	Official website Full listing and sources Checked September 22, 2026

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