Instead of designing separate HATS applications for every mobile device, it is better to design a Responsive Application by following RWD (Responsive Web Design) techniques. An RWD based application needs to be coded only once then it adjusts automatically for all mobile devices with varying factors like OS, platform, screen sizes, orientations, etc. Mobile devices usage is on all time high, so making your legacy green screen applications fitting all mobile devices is not a mere “good to have” feature. It is an absolute necessity to stay competitive.