The WhatTheFont app is powered by deep learning, a type of artificial intelligence which makes it fast and accurate. Because of this, it can to do things the desktop version can’t do, like identify connected scripts and identify multiple fonts in the same image.
After you take a photo, WhatTheFont automatically looks for text. To see the results, just tap the font you want to identify and WhatTheFont will show you a list of possible matches. You can even try out the fonts with your own text.