lunar ☆
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Description:
Adaptive brightness for external displays
Type: Cask  |  Latest Version: 6.9.7@0  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  @lunar_fyi  |  formulae.brew.sh
Category: System utilities
Tags: brightness monitor-control productivity accessibility ddc-ci
Install: brew install --cask lunar
About:
Lunar is a macOS utility that intelligently controls the brightness and volume of external monitors connected via USB-C, DisplayPort, or HDMI. It uses ambient light sensors or keyboard input to automatically adjust display settings, providing a seamless experience similar to Apple's native display features. The tool helps reduce eye strain and improves workflow by syncing external displays with your Mac's built-in screen.
Key Features:
  • Adaptive brightness based on ambient light and keyboard activity
  • Hardware-level brightness control for unsupported monitors
  • Sub-zero brightness for comfortable dark mode usage
  • DDC/CI protocol support for precise monitor adjustments
  • Custom shortcuts and automation workflows
Use Cases:
  • Working in varying lighting conditions with external monitors
  • Matching brightness between MacBook display and external monitors
  • Reducing eye strain during late-night coding sessions
  • Controlling monitors that lack native macOS brightness support
Alternatives:
  • MonitorControl – Open-source alternative with similar DDC/CI functionality but fewer adaptive features
  • Brightness Sync – Basic sync tool without Lunar's advanced automation and sub-zero brightness
Version History
Detected Version Rev Change Commit
Feb 12, 2026 10:14am 6.9.7 0 VERSION_BUMP 4b701058
Jan 30, 2026 10:15pm 6.9.6 0 VERSION_BUMP 8ff052e3
Sep 19, 2025 1:35pm 6.9.0 0 VERSION_BUMP a309ce6a
Jul 30, 2024 9:39am 6.8.1 0 VERSION_BUMP f520f287
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