I’ve started using an external monitor with my Mac a while ago and it’s always been bothering me that at night while my Mac’s screen does dim, the external monitor doesn’t.
A few days ago, I decided to see if there was an app that could help me sync the dim level of my external monitor with the MacBook Pro’s built-in monitor. I looked at SmartSaver, Shades, Screen Shades, Shade Control and a bunch of other apps and none of them seemed to be able to do this simple task. What’s more, most of them seemed to be discontinued and/or haven’t been updated in years.
So I decided to see if there’s anything I can do about it. All I needed to do was read the main monitor’s dim level and overlay a transparent black window with inversely related alpha value over the external screen.
The whole thing fit into less than 100 lines of code, though I also added the ability to automatically start on startup.
If you have any suggestions, comments or questions, feel free to message me or open an issue on GitHub.