Automatically synchronize your external display brightness with your Mac's built-in display

Brisync is a lightweight macOS menu bar application that intelligently adjusts the brightness of your external monitors to match your Mac's built-in display, creating a seamless viewing experience.

• 🔄 Automatic Brightness Sync - External displays automatically adjust when you change your Mac's brightness
• 📊 Custom Brightness Curves - Fine-tune brightness mapping for each external display individually
• 🎛️ DDC/CI Protocol - Brightness is controlled on hardware level via DDC/CI commands
• ⚡ Real-time Adjustment - Instant brightness changes with no noticeable lag

Brisync monitors your Mac's built-in display brightness and communicates with external displays via the DDC/CI interface. The application uses customizable brightness curves to map internal display brightness levels to appropriate external display values.

Each external display can have its own brightness curve, allowing you to compensate for different panel characteristics:

1. Open Brisync settings from the menu bar
2. Select your external display
3. Adjust the sliders to set desired brightness levels at different points
4. The curve interpolates between these points for smooth transitions

• Apple Silicon: Use Brisync 2
• Intel-based Macs: Use Brisync

brew install brisync

1. Download the latest release from Releases page
2. Extract the .zip file
3. Move Brisync.app to your /Applications folder
4. Launch Brisync from Applications or Spotlight

On first launch, you may need to:

1. Right-click the app and select "Open" (if you see a security warning)
2. Grant necessary permissions in System Preferences → Security & Privacy

If you find Brisync useful, consider supporting its development: