There are two words that when seen in print by a smartphone user, will instantly get him or her to react by installing a particular app, or checking to see if an update has been received for an app already installed. Those two words are Dark Mode. This is a feature that reverses the typical black text on white background so that the screen shows white text on a black background.
Android Q is supposed to feature a system-wide Dark Mode in its final version, and iOS 13 is rumored to have the same thing.
