No, that’s not necessary and also not recommended (because this also removes your registration information).

However, your installed Little Snitch 4 version will not be compatible with newer versions of macOS (11 and later) and must be upgraded.

When you upgrade to a newer version of Little Snitch, the existing, outdated installation will be automatically removed (this requires a restart of the computer for one last time).

Your existing rules and settings from Little Snitch 4 will be preserved.

Usually it should be sufficient to move the Little Snitch application to the trash in order to uninstall it. Unfortunately, Apple has introduced two bugs in macOS 15.3 causing this method not to work anymore.

You now first have to manually delete the Little Snitch Network Extension:

1. Open System Settings.

2. Select General > Login Items & Extensions.

3. Scroll down to the Extensions section.

4. Click the i icon next to “Network Extensions”.

5. Click the action icon (three dots) and choose “Delete Extension” from the menu.

If you also have the Endpoint Security extension installed, delete this extension as well by clicking the i icon next to “Endpoint Security Extensions” and deleting the extension there.

Now you can move the app to the Trash in Finder.

Little Snitch consists of multiple components. It is therefore essential to run the Little Snitch Uninstaller to make sure all components are removed from your system. Little Snitch automatically starts the uninstaller as soon as you move the Little Snitch Configuration application to the trash. Alternatively you can start the uninstaller manually from /Library/Little Snitch/Little Snitch Uninstaller.app.

The uninstaller lets you choose whether to remove or preserve user specific data (like rules and settings). If you want to remove those items manually, delete the following files and folders (the “~” tilde sign refers to your home folder):

• /Library/Application Support/Objective Development/Little Snitch

• ~/Library/Application Support/Little Snitch

• ~/Library/Preferences/at.obdev.LittleSnitchConfiguration.plist

• ~/Library/Preferences/at.obdev.LittleSnitchNetworkMonitor.plist

• ~/Library/Preferences/at.obdev.LittleSnitchInstaller.plist

Just move the Little Snitch application in Finder from your Applications folder to the trash.

This will completely remove all components of Little Snitch, including all its system extensions and helper tools.

Your configuration data (which is stored at /Library/Application Support/Objective Development/Little Snitch) will not be deleted. So if you decide to reinstall Little Snitch at a later point, your rules and settings will still be in place.

Yes, your existing rules from Little Snitch 4 will be preserved.

Little Snitch 4 should not be uninstalled prior to upgrading to macOS Big Sur to preserve your rules and your registration information.