LuLu
A free, open-source firewall for macOS that blocks unknown outgoing connections
Free · Open sourceLatest versionMac
About LuLu
LuLu is a free, open-source firewall for macOS. Nearly every application makes network connections, and so does malware, so LuLu blocks unknown outgoing connections to help protect your privacy and your Mac.
It is for Mac users who want to see and control which programs reach the network. LuLu uses Apple's Network Extension framework, and its recommended default options let Apple software and already installed programs keep accessing the network without alerting you.
Highlights
- Blocks unknown outgoing network connections
- Built on Apple's Network Extension framework
- Defaults that allow Apple software and already installed programs without alerts
- Settings you can change later
- Runs from the status bar and starts automatically at login
Description adapted from the project README.
- Version
- 4.5.1
- Updated
- Aug 5, 2026
- Size
- 6.9 MB
- License
- GNU GPL 3.0
Open source details
- Source code
- Exact source for v4.5.1
- Released
- Aug 5, 2026
- GitHub stars
- 13.3K
Community project. Help and bug reports go to the maintainers on GitHub; AppsXi does not provide support for this app.
License
CopyleftGNU GPL 3.0
Use and change it freely; anything built from it must be shared under the same license, with its source.
Read the full licenseHow this app was checked
AppsXi checks every version before it is listed.
Signed by Objective-See, LLC (VBG97UB4TA)
Apple Developer ID team VBG97UB4TA
Notarized by Apple
Hardened Runtime on
File matches the hash GitHub published
SHA-256 98f4d3427f4c6fccf9680fed22879be90a5ae81e80eb8616c1d758755b6bb624
No malware found
ClamAV 1.5.4 on Oct 13, 2026
Install and behavior test in a virtual machine: not run yet
Coming soon for all listings.
Versions
4.5.1checked
Checked Oct 13, 2026 · Mac
DMG · 6.9 MB
Questions about LuLu
Is LuLu free?
Yes. LuLu is free and open source under the GNU GPL 3.0. AppsXi lists the maintainers' official release and does not charge for it.
Is LuLu safe to download?
AppsXi downloads every version of LuLu from the maintainers' official GitHub release and checks it before it is listed. For version 4.5.1 (checked Oct 13, 2026), the Mac download is signed by its developer and notarized by Apple, each file matches the checksum GitHub publishes for the release, byte for byte and a malware scan found nothing.
Does LuLu run on Apple silicon Macs?
Yes. LuLu has a native Apple silicon build, and it runs on Intel Macs too.
What does LuLu need to run?
LuLu needs macOS 10.15 or later.
Who makes LuLu?
LuLu is an open source project by Objective-See Foundation on GitHub (objective-see/LuLu). Help and bug reports go to its maintainers there.
Reviews
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