If the cost is a barrier, consider these open-source and free firewall tools for Mac:
You can download the official Little Snitch version and run it in demo mode. It provides the same protection as the full version but resets every three hours.
An open-source tool for advanced users who prefer a command-line interface. Download – Little Snitch 3 - Objective Development
If you want to try Little Snitch without paying immediately, the developer offers official free options:
Unauthorized modifications to Little Snitch, which operates at the system kernel level, can cause system crashes or data loss .
If the cost is a barrier, consider these open-source and free firewall tools for Mac:
You can download the official Little Snitch version and run it in demo mode. It provides the same protection as the full version but resets every three hours.
An open-source tool for advanced users who prefer a command-line interface. Download – Little Snitch 3 - Objective Development
If you want to try Little Snitch without paying immediately, the developer offers official free options:
Unauthorized modifications to Little Snitch, which operates at the system kernel level, can cause system crashes or data loss .