The Apple App Store is the second largest platform in the world in terms of app downloads. In terms of revenue, the App Store is even the biggest platform in the world. Therefore there is great potential in creating an iOS app. Creating a great app can be a lot more challenging though than just using a simple toolkit, even though such a toolkit like Xcode is often a great way to start. Apps for iOS can be built in multiple programming languages, even though Apple itself is pushing for SWIFT. This way apps can be built to be compatible with iPhones, iPads and iPods.