LuLu
Outbound traffic firewall
open sourceSecurity
LuLu is an outbound firewall from Objective-See: shows which program connects where and blocks at your decision. Helps catch nosy apps and telemetry. Completely free; the paid Little Snitch offers more flexible rules.
// Install
Your MacHomebrew in /opt/homebrew
brew install --cask lulu// What it is for
- Shows which app is reaching out and where — outbound connections stop being invisible
- Rules are set once and then work silently
- Free and open source, from a macOS security researcher
- Sends nothing about your traffic anywhere — all analysis is local
// Common questions
How is it different from the built-in macOS firewall?
The system firewall governs incoming connections. LuLu watches outgoing ones — the path an app would use to send data out. Different jobs, and they complement each other.
Will the prompts drive me mad?
The first couple of days are busy while rules form for your usual apps. After that the window appears rarely — and the rare case is usually the interesting one.