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Little SnitchOpenSnitch
Paid

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

 Free

Free and open source under the GPL.

macOS Linux
  • Per-application outbound rules with a clear prompt at the moment of connection
  • Network monitor shows exactly which process is talking to where
  • Prompts on every new outbound connection, so unexpected traffic becomes visible
  • Blocks ad, tracker and malware domains system-wide
  • One-time paid licence, macOS only
  • The initial flood of prompts takes patience to train
  • Linux only
  • The first days are a stream of prompts until your rules settle
Downloadable app Downloadable app
Closed source Open source
License not stated License: GPL-3.0
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 22, 2026

Checked September 21, 2026

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