MonitorControl is a macOS display control utility and external monitor manager. It functions as a DDC/CI display controller that allows users to adjust the brightness and volume of third-party monitors using native Apple keyboard keys.
The software mimics native macOS hardware feedback by implementing a system overlay tool that renders on-screen display indicators during adjustments. It further provides the ability to synchronize brightness levels across multiple screens or replicate ambient light sensor changes to external displays.
The utility includes capabilities for mapping custom keyboard shortcuts to brightness and volume actions and managing hardware-level communication via the Display Data Channel protocol.
