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Radio Silence vs Murus: catalog facts
Radio Silence	Murus
Paid One-time price of $9 with a free trial and a 30-day money-back guarantee.	Freemium Offered in three versions at different levels; see the website for current prices.
macOS	macOS
Blocks an app with a single click Shows background helpers and daemons that make connections	Uses the PF firewall already built into macOS Port knocking, adaptive firewall and NAT
macOS only Does not prompt about new connections, so blocking is manual	macOS only Works at the network layer; per-app control needs the separate Vallum app
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	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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