In a method for displaying a user interface at a device, a software application i received at the device, wherein the software application includes multiple classes of user interfaces pertaining to different versions of the software application executing on different device platforms having at least a same form factor or a same operating system, wherein the software application includes a master view and a plurality of subordinate views, wherein each of the subordinate views pertain to one of the multiple classes of user interfaces. The software application is executed at the device. An appropriate user interface of the multiple classes of user interfaces is determined for device based on at least a form factor of the device. The appropriate user interface is displayed at the device by displaying the master view and the subordinate view for the appropriate user interface.