XCreen

Pure Rust External Monitor Brightness Control

Adaptive brightness and contrast adjustment for external monitors using DDC/CI

A lightweight, native Windows application for automatic brightness control of external monitors using ambient light sensors.

Features

• Ambient Light Brightness: Manually set monitor brightness and contrast based on current ambient light sensor reading
• Manual Brightness Profiles: Set predefined brightness levels (Dim, Normal, Max, etc.)
• Windows Autostart: Automatically start the application when Windows boots
• Configurable Settings: All settings stored in a config.json file
• Monitor Support: Works with all DDC/CI compatible external monitors
• Native System Tray: Lightweight tray integration
• Monitor Detection: Automatically detects and manages external monitors that support DDC/CI

Installation

From Release

1. Download the latest xcreen.exe from the Releases page
2. Place the executable in your desired location
3. Run xcreen.exe
4. Right-click the system tray icon to access features

Configuration

The application uses a config.json file located in the same directory as the executable. This file is automatically created with default values when the app first runs.

Configuration Options

{
  "autostart_enabled": false,
  "last_brightness": 50,
  "brightness_profiles": [
    {
      "name": "Dim",
      "brightness": 15,
      "contrast": 30
    },
    {
      "name": "Normal",
      "brightness": 55,
      "contrast": 75
    },
    {
      "name": "Max",
      "brightness": 100,
      "contrast": 100
    }
  ],
  "log_level": "warn"
}

License

MIT License - see LICENSE file for details.