For Mac Free Download — Little Snitch 4.0

Little Snitch is commercial software, but it offers a robust free download that functions as a "demo mode":

You must use version 5 or higher for native support on Apple Silicon Macs. Key Features of the 4.0 Series Little Snitch 4.0 for Mac Free Download

If you are running an older Mac, version 4 introduced several major improvements that remain useful: Download Little Snitch - Objective Development Little Snitch is commercial software, but it offers

Little Snitch 4.0 is highly compatible with OS X El Capitan through macOS Catalina. However, you can re-activate it as many times as you like

The network filter (firewall) deactivates every three hours . However, you can re-activate it as many times as you like.

Little Snitch 4 was designed for older versions of macOS. Compatibility is the most important factor when choosing which version to download:

The demo mode provides the same protection and functionality as the paid version.