The best alternatives to Image Dimmer are Captain Share, Dark Mode List, and scenify. If these 3 options don't work for you, we've listed a few more alternatives below.
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Dark Mode Design is an inspiration resource showcasing beautifully designed websites that are either exclusively in dark mode or have the ability to switch.
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.