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.
Smartly adjusts your Mac's brightness according to white or dark content on your screen. So that you never get distracted with too much brightness when using dark mode. Once you set brightness for dark screen and bright screen individually the app interpolates the brightness to all in between shades of your screen content.
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Controll your mac's screen brightness based on which app is in focus. Set the desired brightness per app and continue with your work and let "menubar-auto-brightness" automatically adjust screen brightness when you switch apps. Improve your productivity!