Did you know that apps designed for the iOS platform are not always universal applications? In other words, not every app available in the Apple App Store can be used for both iPhone/iPod Touch and iPad products interchangeably. Therefore, iPhone app developers will need to use the proper iPhone apps development tools if they want to create a universal application that also works well on iPad devices.
The main –and most obvious – difference between the iPad and the iPhone is size. A tablet has a significantly larger screen than a smartphone. Due to the fact that apps are formatted to fit the size of the device’s screen, if a universal app is not created, iPad apps will not work on iPhones. Likewise, iPhone apps will not have the same resolution quality when used on an iPad, because they will need to be stretched to fit the screen.
A universal application allows for an app to maintain quality functionality and resolution on both devices. This is achieved by splitting data that can fill a single iPad screen, across several screens on the iPhone.
In addition, Apple mobile users should be aware that just because an app may be available for one device, it does not mean that it is available for another. Some companies only make apps for one gadget. Therefore, before you download an application for your iPhone or your iPad, find out for which device it was specifically developed or whether or not it is universal.