Twinkle Tray is a free, open-source Windows application that lets you control the hardware brightness of multiple external monitors directly from your system tray. While Windows natively handles brightness for built-in laptop screens, it lacks a built-in feature to adjust the backlighting of external desktop monitors. Twinkle Tray bridges this gap by inserting a volume-style slider menu into your taskbar for easy, independent display control. Core Features
Hardware Communication: Uses DDC/CI (Display Data Channel/Command Interface) and WMI to change the monitor’s actual hardware settings, replacing the need to fiddle with clunky physical monitor buttons.
Multi-Monitor Syncing: Allows you to adjust sliders individually or link multiple monitors together to scale their brightness simultaneously.
Automation & Scheduling: Automatically alters your screen brightness based on the time of day (e.g., dimming at night) or dims displays to save energy when your PC goes idle.
Custom Hotkeys: Lets you map specific keyboard shortcuts to raise or lower brightness on the fly.
Seamless Windows Integration: Automatically adapts its visual theme to match the native look and feel of Windows 10 or Windows 11.
Extended Display Controls: Accesses other DDC/CI-supported settings directly from the app, such as contrast, volume, and power states.
App-Specific Profiles: Can adjust monitor brightness automatically depending on the specific application or game you currently have active. Limitations
Compatibility: It is strictly limited to Windows 10 and 11. It does not support macOS.
Hardware Requirements: Your external monitors must have DDC/CI enabled within their physical On-Screen Display (OSD) settings menus for the app to communicate with them.
HDR Limitations: It lacks robust support for controlling brightness on some HDR-enabled displays. Where to Download
The software is entirely free under the MIT license with no paid tiers or subscriptions. You can download it via: Twinkle Tray: Brightness Slider for Windows
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