I've built and continue to maintain a popular Australian tax calculator website paycalculator.com.au. To complement the website I created an iOS version. The app features a single view with collapsable sections to provide more detail on demand. This allows for a vary clean and simple UI without having to switch back and forth between different views. In addition, the application checks an online data source to check for any changes to the configuration which allows the app to be up-to-date. The application is also Universal to both the iPhone and iPad.
Click the image below to view the app in the Apple AppStore.