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Little Snitch
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Little Snitch 5 for macOS Big Sur now available! →

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for macOS Big Sur

Release Notes
Download 5.1.1

for macOS Catalina

Release Notes
Download 4.6

Version 4 of Little Snitch can not be installed on macOS Big Sur by default, because Apple has discontinued support for Network Kernel Extensions. Learn more…

Still on macOS Mojave or earlier?

Older Versions

Assuming you’ve downloaded the Little Snitch Disk Image (.dmg file) to your Downloads folder, open a new Terminal window and enter the following command to verify the cryptographic signature of the downloaded file:

codesign --verify -R="anchor apple generic and certificate leaf[subject.OU] = MLZF7K7B5R" ~/Downloads/LittleSnitch*.dmg

If the result of this command is empty (no error message is shown), the file is intact and properly signed by Objective Development.

However, if an error message is shown (like “not signed at all” or “failed to satisfy specified code requirement(s)”), this indicates that the file was maliciously modified and is no longer signed by Objective Development. In that case you should NOT open the disk image file.

Without a license key, Little Snitch runs in demo mode, which provides the same protection and functionality as the full version. The demo runs for three hours, and it can be restarted as often as you like. The Network Monitor expires after 30 days. Turn it into a full version by entering a license key.

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© 2021 Objective Development Software GmbH

About UsPressPrivacyTerms