As of iOS 18 beta 3, all app icons adapt to the dark theme, including unoptimized ones from third-party developers. The OS automatically detects the icon’s colors and applies a dark background ...

With a bit of luck, your custom dark mode icon will look the part on your personalized Home Screen. Note: If you have several app icons that you want to create dark mode equivalents for, make sure ...

In case you’re curious, I’ve checked the implementation for icon segmentation in iOS 18 to see how they’re generating the dark icons. There’s no ML/AI involved, it’s all just clever math.