Reimplementation · Other

LuLu

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Summary

A macOS outbound firewall with connection alerts and per-application allow/block rules.

Description

An open-source outbound application firewall accepted as a broader Little Snitch alternative. Uses a macOS Network Extension to detect outgoing connections, display process and destination details, request allow/block decisions, and manage persistent application rules. Includes temporary decisions and configurable filtering behavior, with local rule management and a menu-bar interface.

Source repository ↗Website ↗Documentation ↗

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Screenshots

LuLu connection alert with application details and allow/block controls.

Compatibility and scope

Status and compatibility are maintainer-reported. Inclusion is not an independent verification or certification.

Development status: Stable
Compatibility: Partial (claimed)
Languages: Objective-C
Platforms: macOS
License: GPL-3.0-only

Known limitations

Requires macOS 10.15 or later and approval of its system extension and network filter. Not a full Little Snitch replacement: its rule-file compatibility, traffic-history and visualization parity are not established. Default settings may allow Apple and already-installed applications without prompting; review the filtering configuration.