Description:
Open-source firewall to block unknown outgoing connections
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Type: Cask
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Latest Version: 4.3.2@0
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Tracked Since: Dec 28, 2025
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Links:
Homepage |
@objective_see |
formulae.brew.sh
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Category: Security
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Tags:
firewall
security
networking
privacy
macos
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Install:
brew install --cask lulu
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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.
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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
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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
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Alternatives:
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Little Snitch
– The most well-known alternative, offering more advanced features but with a more complex UI and a higher price point.
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TripMode
– Focuses on controlling network usage per app, especially useful for mobile hotspots, with a simpler interface.
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| Detected |
Version |
Rev |
Change |
Commit |
| May 3, 2026 7:13pm |
4.3.2 |
0 |
VERSION_BUMP |
780e40d7 |
| Mar 17, 2026 7:28pm |
4.3.1 |
0 |
VERSION_BUMP |
b48dbf75 |
| Mar 14, 2026 4:43am |
4.3.0 |
0 |
VERSION_BUMP |
2cc7b641 |
| 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 |
| Nov 18, 2023 9:15am |
2.5.1 |
0 |
VERSION_BUMP |
0894d9a6 |
| Oct 30, 2023 6:22pm |
2.5.1 |
0 |
VERSION_BUMP |
bf200c12 |
| Oct 27, 2023 4:32pm |
2.5.1 |
0 |
VERSION_BUMP |
8debc50c |
| Apr 4, 2023 8:40pm |
2.4.3 |
0 |
VERSION_BUMP |
68a71bf5 |
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