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Little Snitch

Objective Development Software GmbH · Little Snitch @4 is a macOS host-based application firewall.

CaskSecurity & PrivacyAuto-updatesApple silicon · IntelDisabled
Homepage
From homebrew/cask
30-day installs0
1-year installs18Last 365 days
Latest version4.6.1Apr 29, 2024 · Apr 29, 2024
Download size43MBarm64 / x86_64 · dmg
Release cadenceIrregular0 releases in 30 days

Little Snitch is Security & Privacy software for Mac.

About

This Homebrew cask installs the little-snitch@4 variant. Install with brew install --cask little-snitch@4, then follow the installer. This version requires a kernel extension to work. If installation fails, the cask advises enabling the extension under System Settings → Privacy & Security and retrying. Reboot the Mac for the installation to take effect. The cask uses a manual installer from the downloaded disk image and conflicts with the little-snitch, little-snitch@5, and little-snitch@nightly casks.

Sources: Little Snitch · Homebrew cask

New What’s new in 4.6.1 From Homebrew commits

This release has no separate notes.

See all 1 release

Install and uninstall

Install without Homebrew

Download the same file Homebrew uses: www.obdev.at/downloads/littlesnitch/legacy/LittleSnitch-4.6.1.dmg

SHA-256 only checks that the download is complete; it is not a security certification. See the SHA-256 and download address

Uninstall command
$ brew uninstall --cask \little-snitch@4

A regular uninstall removes the app and keeps its settings and caches.

Deep clean (optional)
$ brew uninstall --zap --cask \little-snitch@4

--zap also deletes the settings, caches and other files listed in the Homebrew definition. They can include data shared with other apps and cannot be restored, and it does not guarantee that nothing is left.See which files are removed

Facts and sources

Version 4.6.1
Recorded by Homebrew on Apr 29, 2024

Questions

Is Little Snitch safe?

Little Snitch is in Homebrew’s official catalog and has not been disabled. Since September 2026, Homebrew disables apps that fail macOS Gatekeeper checks. When installing, Homebrew checks the download from www.obdev.at against its SHA-256 checksum.

How do I completely uninstall Little Snitch on a Mac?

Run brew uninstall --cask little-snitch@4. It stops 3 background services. To delete its settings and caches as well, run brew uninstall --zap --cask little-snitch@4. That also deletes 25 files and folders, including ~/Library/Application Support/Little Snitch.

Does Little Snitch run on Apple silicon (M1 and later) Macs?

Homebrew installs it on both Apple silicon and Intel Macs, from the same download.

Where does Little Snitch store its settings and data?

Its settings are in ~/Library/Preferences/at.obdev.LittleSnitchAgent.plist. Its data is in ~/Library/Application Support/Little Snitch. These locations come from Homebrew’s clean-up list.

What is the latest version of Little Snitch?

The latest version is 4.6.1, added to Homebrew on Apr 29, 2024. Little Snitch updates itself; to update it with Homebrew, run brew upgrade --cask --greedy little-snitch@4.

Caveats

little-snitch@4 requires a kernel extension to work.
If the installation fails, retry after you enable it in:
  System Settings → Privacy & Security

For more information, refer to vendor documentation or this Apple Technical Note:
  https://developer.apple.com/library/content/technotes/tn2459/_index.html

You must reboot for the installation of little-snitch@4 to take effect.