Top iOS Apps from 2012 that Mastered Usability: http://t.co/NYptLXrp
This is very responsible and difficult task to make application easy-to-use, secured, beautiful and functioning properly. Lots of factors need to be considered. Great user interface and user experience (UI and UX) are two very important factors. But unfortunately, it takes too many developers efforts to achieve it. You need to take into account wide range of challenges from screen size to touch screen.
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