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