vallum ☆
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Description:
Application firewall
Type: Cask  |  Latest Version: 5.1@0  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  formulae.brew.sh
Category: Security
Tags: firewall network-security traffic-filtering monitoring privacy
Install: brew install --cask vallum
About:
Vallum is a lightweight application firewall for macOS that operates at the socket layer, allowing granular control over network traffic for individual applications. It provides real-time monitoring and filtering capabilities, enabling users to block or allow connections based on rules. This tool offers a more precise alternative to host-based firewalls by focusing specifically on application-level network behavior.
Key Features:
  • Real-time network traffic monitoring
  • Granular application-based filtering rules
  • Lightweight and low system resource usage
  • Visual interface for connection management
Use Cases:
  • Preventing unauthorized data exfiltration from specific apps
  • Debugging network issues by inspecting app connections
  • Enforcing security policies on a per-application basis
Alternatives:
  • Little Snitch – Vallum is often considered a more lightweight and focused alternative with a simpler rule system.
  • Lulu – Lulu is a free, open-source alternative, while Vallum offers more advanced features and a dedicated GUI.
Version History
Detected Version Rev Change Commit
Sep 16, 2025 3:01pm 5.1 0 VERSION_BUMP 1d0786a2
Sep 15, 2025 1:20pm 5.0.3 0 VERSION_BUMP 8a236a0e
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