About
Lulu is a free, open-source firewall for Mac that blocks unknown outgoing connections to protect your privacy. Designed for users concerned about unauthorized data transmission, it monitors all outbound traffic and prompts you to allow or deny connections before they establish. The standout feature is real-time visibility into what applications are trying to connect to the internet, giving you granular control over which programs can communicate externally. By default, it operates in a block-by-default mode, requiring explicit approval for outbound connections rather than the permissive approach of macOS's native firewall.
At a glance
Lulu is available on macOS — all free to download.
It is developed by Objective-See.
Install on macOS via Homebrew with brew install --cask lulu.
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