Swiftkey UX/UI Redefined. Nice Job! 

iOS 7 Outline Design Standards Fading… 

Swiftkey released a very nice redesign that enhances existing functionality, making it easier to navigate - using flat and graded color, icons and soft shadows. In a world that need to be simple, color is required. Excellent approach for mature applications with a strong user base.  

https://medium.com/@swiftkey/how-swiftkey-is-using-material-design-to-boost-user-engagement-e8f01f54e6d4