Control the brightness of external monitors with your Mac's brightness keys!
This a utility application to control the brightness of external monitors directly from your keyboard.
Use the F1 / F2 key to decrease / increase the brightness of the screen showing the active window. If you have an Apple or similar keyboard, you probably need to also press the fn key.
For a finer brightness level adjustment, you add the option key, i.e use alt + F1 to decrease the brightness, or alt + F2 to increase it.
This app shows the native system UI when changing brightness!
If you have multiple external monitors connected to your Mac, the brightness adjustment is done on the monitor with the currently active window, and the brightness system UI is displayed on the adjusted monitor.
If you press the shift key in conjunction with the F1 or F2 keys, then the brightness is ajusted on all connected screens simultaneously (including the builtin screen on a MacBook) and the brightness system UI is displayed on every screen to indicate the current brightness of the screen.
Your monitor needs to support DDC/CI for this app to work. If you don't see the brightness system UI displayed on your monitor when pressing the F1 / F2 keys, this means that your monitor is not supported.
If your monitor supports reading the current brightness value from DDC/CI, the app increments / decrements the brightness starting from the monitor current brightness value. This allows you to set the brightness using the monitor's OSD and to adjust it later with the app
For showing the native system UI for brightness adjustment, this app uses the macOS private framework BezelServices.
macOS version: 10.10 to 10.14
This application uses code borrowed from ddcctl which uses code from DDC-CI-Tools
GNU GENERAL PUBLIC LICENSE