With windows 10 coming very soon im hoping they make a universal app. This would then cover multiple devices at the same cost of developing for one device. If this is already in development then great, if not please consider it! It would cover PC's, Tablets, Phones, Xbox, Laptops and anything else that runs windows 10 without having to use browsers.  And remember windows 10 will be a free upgrade for windows 7 and up!