Lunar

The application lets you adjust brightness, contrast, volume, and input source on external displays directly from macOS. It communicates with monitors via DDC to set real brightness levels rather than using overlay tricks, and it also supports native control of Apple‑made displays through macOS Display Services. Features include keyboard shortcuts for brightness and volume, ambient‑light sensor integration, and the ability to black out screens or enable FaceLight for FaceTime.

For users with multiple monitors, the tool can keep all displays synchronized, mirroring macOS’s adaptive brightness across external screens. It also offers a “Sync Mode” that applies any brightness change made via Touch Bar, keys, or ambient light to every connected monitor. The free version provides these core controls, while a paid tier adds advanced capabilities such as unlocking the full brightness range of XDR displays and breaking preset brightness limits.

The software runs on macOS 11 and later, supporting both Apple Silicon and Intel Macs, and is released under an open‑source license with a stable maturity level. It is intended for anyone needing precise, system‑wide control of external monitor settings without relying on hardware buttons.