LuLu
lulu · v4.3.2
Open-source firewall to block unknown outgoing connections
brew install --cask lulu Trust Score 9/10
Version History
v4.3.2Review
Mar 10, 2026LuLu is a free, open-source macOS firewall designed to block unknown outgoing connections, providing users with control over their network traffic. It is a popular alternative to paid firewall solutions like Little Snitch, offering transparency and customization for security-conscious users.
Blocks unknown outgoing network connections on macOS to enhance privacy and security.
Maturity: The project is mature with strong community support, though it has a significant number of open issues and lacks auto-updates.
Community: LuLu has generated considerable discussion on Hacker News and Reddit, with praise for its open-source nature and concerns about compatibility with newer macOS versions and Apple's apps bypassing its firewall.
Pros
- + Free and open-source with a strong community backing.
- + Effective for monitoring and blocking unknown outgoing connections.
- + Customizable rules for network traffic control.
Cons
- - Lacks auto-updates, potentially leaving users with outdated software.
- - Known compatibility issues with macOS Big Sur and newer versions.