We are going to develop a ToDo application in React Native. The user can add, update and delete todos. But, while we are thinking this as like a real world application we will have some annoying ads in screen User can upgrade to PRO account to get rid of ads. So, in our app will have a second screen /upgrade-pro screen. In this screen we will have a button to upgrade pro. We will use Metricalp to track user behaviours to analyze our app. Trust me it is gonna be fun.