Besides, you can take a look at some stats that proof that games are the most frequently downloaded type of mobile apps — and this is a clear sign your users will like gamification elements. In-app purchases is an extremely popular strategy used by thousands of apps in both the Google Play Store and the Apple App Store. The U. Such ads appear during natural pauses of app usage and last seconds. Mobile App. Considering the popularity of such online services as Udemy and Coursera that acquired millions of users in a matter of months, we can be sure that your app will find its users fast if it is truly outstanding, helpful and intuitive for them, of course.