LuLu

SecurityOpen Source

by Objective-See LLC

Apple Silicon NativeIntel Core SupportmacOS 11.0 or later

4.60

•124 User Reviews•Free (Free, supported by Patreon donations)

About LuLu

LuLu is an open-source, outgoing-only firewall application for macOS. It specializes in letting you know when local applications attempt to transmit data outward onto the internet.

Screenshots Gallery

Slide 1

Core Feature Sets

✓Monitors all outgoing app network operations
✓Rules management panel to whitelist trusted software
✓Displays process info and endpoint IP address
✓Very low CPU/battery consumption

Pricing Specs

Licensing TypeFree

Cost ParametersFree, supported by Patreon donations

Developer IdentityObjective-See LLC

DMG verified authentic

Scanned for security. Redirects to official developer repositories only.

Ratings & Reviews

What the developer and community say about LuLu.

4.6out of 5

Submit Your Review

Nils S.2026-05-22

Brilliant free firewall

Incredibly useful for tracking which software is tracking me! It doesn't look as fancy as Little Snitch, but it does the exact same thing for free.