Got that - but what I'm asking is, has anyone even written an app for iOS or Android that works with either of the consoles? Not looking for something that has

Got that - but what I'm asking is, has anyone even written an app for iOS or Android that works with either of the consoles? Not looking for something that has worked with all, just something that has worked with one, who did it, how they did it, how much it cost and what it was written for.