If the cost is a barrier, consider these open-source and free firewall tools for Mac:

A simplified version is available on the Mac App Store where the network monitoring features are free to use.

Unauthorized modifications to Little Snitch, which operates at the system kernel level, can cause system crashes or data loss .

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.

The software typically includes a generous trial period to let you test its full capabilities before committing to a purchase. 💡 High-Quality Free Alternatives

A free, open-source firewall by Objective-See that blocks unauthorized outgoing connections, similar to Little Snitch.

A very affordable, simple firewall with no subscriptions.

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