As a mobile app designer or developer, you’ll probably at some point of time will have to show your design to your client or team. Irrespective of whether you want to create a design for iOS or Android app, you will most likely visualize design ideas in your mind. Make sure to give those ideas a visual (or concrete) form, or you may forget them. One best way to do so requires prototyping an app design. Once you’ve finalized your prototype, you can begin with building your app using some mobile platform.