Pixter Scanner OCR is one of the first applications from App Store in which the new UI elements thought by the company were implemented Apple Lossless Audio CODEC (ALAC), for the new version of your operating system. Basically those upper/lower bars have a different color, the blue buttons are new, and besides these you will notice many other changes in the applications, but the developers have to implement them separately, so the process of updating each application separately will take a lot of time some of them will be updated only weeks or months after the launch iOS 7.
