So you have created an app, and, let’s say, it is perfect. It has been designed and developed by geniuses, and you are dead sure it will do well on an app store. But here’s a catch. Just posting your precious app’s ad won’t be enough for it to actually become a hit. Every good product deserves great marketing. You might be wondering: What is the first step when marketing a mobile app? The answer is KILLER SCREENSHOTS.