Since 2013, the iPhone’s Clock icon has featured a distinctive white clock face against a black square background — a familiar and functional design that many have grown attached to.

Some icons, such as that of YouTube, turn the icon’s normal background black, and even make changes to the icon’s primary color. This is especially interesting in cases where the icon’s ...

What MacRumors suggests is that apps may also be able to opt-in to automatically changing their icon when the phone is in its Dark Mode appearance. The exact implementation method is not known.