When you are thinking about rank your app in Play Store, you must understand this is the challenge at least. Nobody knows why one apps stays more attractive than other. Mostly, it depends on many factors in Google app rank algorithm. So, let`s try to understand how it works. How does Google rank Apps? The reasons are: Retention of an App; Number of Downloads; Download Growth; User Ratings and Reviews; Regular App Updates; Page Rank; Social Media “Rep”; The Keyword Rate Factor; Video Demonstration.Of course, before starting to promote your app - be sure that your app has gorgeous-looking Icon, good screenshots and full description. And follow this tips: Tip 1. Better start to promote your app asap after launching to Play Store. Tip 2. Important key factor is how many installs your app gets during first days. For this reason, use incentive installs. Tip 3. Use forums - such us Making Money With Android Forum, AppBrain, ...