provide sufficient computing power and offer media-rich and
native features that are creative and immersive for mobile
electronic-book applications. These devices have gained
acceptance as target devices for e-book applications. Many
e-book application developers have chosen Apple’s iOS
mobile devices as the target device to provide more
distinguished and richer user experience, as evidenced by the
rapidly increasing number of e-book apps in Apple’s App
Store. By examining the top 25 of such apps from the App
Store, several trends were identified.