You’ve heard it time and time again, “the best way to learn is to see what has already been done”. When approaching the creation of an app for IOS or Android, there is so much one can learn from what is preexisting in the realm of UI and UX. Pttrns.com is an excellent tool for any designer developing an app to really get a sense of what is out there. They supply a wide range of app screens that vary from login screens to side bar menu functions. Their library is always expanding and often has examples of full apps and how they differ from Android to IOS. Be inspired by their site and learn the good, the bad and the extraordinary in UI/UX!