Flat design is here to stay and this year it's been a massive trend when it comes to apps. It's not just because it's aesthetically pleasing, it's also because it provides a better user experience for users - if implemented correctly of course.
Flat UI design is also brilliant when it comes to responsiveness and trying to fit multiple screen sizes - like with an Android app. Because Android works on so many different screen sizes, it's actually a good idea to follow flat design, they're much more responsive.
Here are 20 fantastic examples of flat UI design in apps.