# LuLu for Mac

> The free, open-source outbound firewall.

LuLu blocks unknown outgoing connections until you approve them. Simple, free and from respected Mac security researchers.

## Facts

- Price: Free and open source
- Developer: Objective-See
- Category: Security & Privacy
- Website: https://objective-see.org/products/lulu.html
- Homebrew cask: lulu
- Source code: https://github.com/objective-see/LuLu
- License: GPL-3.0
- GitHub stars: 13k
- Last commit: 2026-10-18
- Facts checked: 2026-10-19
- MacWorthy page: https://macworthy.com/apps/lulu/

## Install

Homebrew:

```sh
brew install --cask lulu
```

## Questions

### Is LuLu free?

Yes. LuLu is free and open source under the GPL-3.0 license. The source code is on GitHub at objective-see/LuLu.

### Where can I download LuLu for Mac?

Download LuLu from the developer's website (objective-see.org) and GitHub. MacWorthy links only to official sources.

### Can I install LuLu from the Terminal?

Yes. With Homebrew, run `brew install --cask lulu`.

### What are good alternatives to LuLu?

Other security & privacy apps for Mac worth a look are Little Snitch (one-time purchase), OverSight (open source), KnockKnock (open source) and Secretive (open source).

## Alternatives in Security & Privacy

- [Little Snitch](https://macworthy.com/apps/little-snitch/): See and control every network connection. (One-time purchase)
- [OverSight](https://macworthy.com/apps/oversight/): Know when your mic and camera turn on. (Open source)
- [KnockKnock](https://macworthy.com/apps/knockknock/): See what's persistently installed. (Open source)
- [Secretive](https://macworthy.com/apps/secretive/): SSH keys that never leave the Secure Enclave. (Open source)
- [Strongbox](https://macworthy.com/apps/strongbox/): KeePass and Password Safe, made native. (Free + Pro)
- [Tailscale](https://macworthy.com/apps/tailscale/): A private network for all your devices. (Free + Pro)

## Collections

- [Free & open source](https://macworthy.com/collections/free-and-open/)
- [Privacy first](https://macworthy.com/collections/privacy-first/)

Tags: firewall, open source