The best alternatives to MonitorControl are Lunar, Sensei, and Nocturnal. If these 3 options don't work for you, we've listed a few more alternatives below.
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The built-in display brightness of your Macbook or iMac is synchronized to the external monitor.
Custom brightness and contrast values are computed for each external monitor by passing the built-in brightness through a curve algorithm that is completely configurable by the user.
Sensei is a native macOS app for monitoring and optimizing your Mac performance. With a wide range of features spanning hardware and software, it can help you clean out your disk space, optimize your boot speeds, monitor your hardware health, and much more.
Nocturnal is a menu bar app for macOS that allows you to go the extra mile in controlling your display settings to reduce strain on your eyes. It includes darker than dark dimming, Night Shift fine tuning, and the ability to disable for custom time periods.