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objective-see/LuLu
LuLu is a free, open-source application firewall for macOS that alerts you when processes make outbound network connections.
Open-source alternative to:Little Snitch
- Stars
- 13,524
- Forks
- 621
- Open issues
- 538
- Last commit
- 5 days ago
What is it?
LuLu is a firewall for macOS that monitors outbound network traffic and lets you decide which applications are allowed to connect. When an unknown process tries to make a connection, LuLu shows an alert so you can allow or block it.
The project is written in Objective-C and released under the GPL-3.0 license. Full documentation and usage instructions are published on the Objective-See website, and the author also accepts support through Patreon.
Key features
- 01Alerts when an application attempts an outbound network connection
- 02Lets users allow or block connections per application
- 03Written in Objective-C and open source under GPL-3.0
- 04Free to use on macOS
Use cases
- Monitoring which apps on a Mac phone home or send data over the network
- Blocking unwanted outbound connections from untrusted software
- Adding a visible layer of network control on a personal Mac without paid security tools
Quick start
- 1
Full install and usage details are on the project's documentation page
Things to know
- macOS only.
- Full installation and usage details are only on an external documentation site, not in the README.
In collections
Topics
FAQ
- What is LuLu?
- LuLu is a free, open-source application firewall for macOS that alerts you when processes make outbound network connections. LuLu is a firewall for macOS that monitors outbound network traffic and lets you decide which applications are allowed to connect. When an unknown process tries to make a connection, LuLu shows an alert so you can allow or block it.
- Is LuLu free to use? What license does it have?
- LuLu is open source under the GPL-3.0 license. Check the license terms before using it in commercial products.
- Is LuLu still maintained?
- Actively maintained. The last commit to LuLu was on Nov 2, 2026.
- What can I use LuLu for?
- Monitoring which apps on a Mac phone home or send data over the network Blocking unwanted outbound connections from untrusted software Adding a visible layer of network control on a personal Mac without paid security tools
- How do I install LuLu?
- Full install and usage details are on the project's documentation page
- Where can I get LuLu?
- The source code and installation instructions are on GitHub: https://github.com/objective-see/LuLu
Summary generated by AI from the project's README. GitHub stats refresh daily.
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