OpenSnitch, an application-based firewall, protects you from unwanted data leaks by letting you set customized rules for all your applications. The main thing that OpenSnitch does is track internet requests made by applications you have installed.
An application firewall can reveal what’s going on behind the user’s back. While conventional firewalls examine the data flow packets to and from the CPU, an application firewall takes an application-specific view when monitoring the outgoing data flow.
See https://rs1.es/tutorials/2023/01/03/opensnitch.html
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