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MurusLittle Snitch
Freemium

Offered in three versions at different levels; see the website for current prices.

 Paid

A one-time purchase is required after the demo period.

macOS macOS
  • Uses the PF firewall already built into macOS
  • Port knocking, adaptive firewall and NAT
  • 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
  • Works at the network layer; per-app control needs the separate Vallum app
  • 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
Works offline Not stated if it works offline

Checked October 2, 2026

Checked September 22, 2026

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