lulu ☆
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Description:
Open-source firewall to block unknown outgoing connections
Type: Cask  |  Latest Version: 4.2.1@0  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  @objective_see  |  formulae.brew.sh
Category: Security
Tags: firewall security networking privacy macos
Install: brew install --cask lulu
About:
LuLu is a free, open-source macOS firewall designed to monitor and block unauthorized outgoing network connections from applications. It operates by intercepting network traffic and prompting the user to allow or deny connections, effectively preventing malware and unwanted apps from communicating with the internet. This tool provides a transparent layer of security, giving users granular control over their device's network activity.
Key Features:
  • Real-time monitoring of outgoing connections
  • Simple, user-friendly pop-up alerts for connection decisions
  • Rules-based filtering for persistent allow/deny rules
  • Lightweight and unobtrusive background operation
  • Open-source code for transparency and security audits
Use Cases:
  • Preventing malware and spyware from exfiltrating data
  • Blocking tracking and analytics requests from applications
  • Controlling which apps can access the internet on a personal Mac
  • Adding a layer of security for privacy-conscious users
Alternatives:
  • Little Snitch – The most well-known alternative, offering more advanced features but with a more complex UI and a higher price point.
  • TripMode – Focuses on controlling network usage per app, especially useful for mobile hotspots, with a simpler interface.
Version History
Detected Version Rev Change Commit
Feb 1, 2026 10:03pm 4.2.1 0 VERSION_BUMP d1933e81
Sep 15, 2025 12:25pm 4.0.1 0 VERSION_BUMP 166d120b
Sep 2, 2025 1:33am 4.0.1 0 VERSION_BUMP 70407a51
Aug 25, 2025 10:14pm 4.0.0 0 VERSION_BUMP c3462bcb
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