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OpenSnitchLittle Snitch
Free

Free and open source under the GPL.

 Paid

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

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

Checked September 21, 2026

Checked September 22, 2026

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