For this reason, it is difficult to put a figure on just how much a game app will cost to develop, it depends entirely on how complex you want to go. The cost could range anywhere from $10,000 to $250,000 and beyond. Think about your first encounter with a video game and how it looked.eferring specifically to the cost of designing an iOS app, Thomas estimates a figure of between $500 and $10,000, although he notes that between 25 and 50 per cent should be added on to this figure if you are planning to launch your app on the iPad or other iOS devices.