Mobile applications, just as websites, need promotion. To make an Android application profitable it needs visibility and must be downloaded by as many users as possible. The quickest way to do this is through promotion and popularization of the product. More often than not users install applications they see on the top charts of the Google Play store, and from the top results of popular search requests. Take note that the term “top” is flexible and depends on the size of the user’s device screen. For instance, tablets with a screen size of 10,1" show 10 applications on the results page, while smartphones with a screen size of 3,2" show only 2 applications. While searching for a needed program a user looks through 3-6 pages, so the top positions are from 1 to 60. Certainly, the top ten applications are considered the most popular.