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Radio Silence vs Little Snitch: catalog facts
Radio Silence	Little Snitch
Paid One-time price of $9 with a free trial and a 30-day money-back guarantee.	Paid A one-time purchase is required after the demo period.
macOS	macOS
Blocks an app with a single click Shows background helpers and daemons that make connections	Per-application outbound rules with a clear prompt at the moment of connection Network monitor shows exactly which process is talking to where
macOS only Does not prompt about new connections, so blocking is manual	One-time paid licence, macOS only The initial flood of prompts takes patience to train
Downloadable app	Downloadable app
Closed source	Closed 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.