I think hardly anyone would disagree with the fact that smartphones today are used primarily not for calls but for Internet surfing, messaging in different apps with friends, buying everything from apps. And from my perspective, a lot of shop owners (we talk about large retail shops first and foremost, but not limited to) still underestimate the buying power of users within apps.
But people tend to use smartphones not only for buying. A lot of people use it to kill time by playing games (there’s a plethora of different games to all tastes on the market today), to browse the Internet via different browsers. All this is done within apps.
Every day thousands of apps are downloaded and installed on smartphones. While precise statistics is not available (at least, not while you will create a poll for all mobile developers like these guys to participate in it), you can still pretty easily say that the numbers are huge.
Another important moment is that it’s not good if a user just downloads your app. It’s crucial that users keep interacting with your app after installing it, rather than quickly deleting it immediately or soon after installing.
It’s also possible to create lists of most popular apps. In fact, such platform as AppStore and Google Play rank apps within their search engines. The main criteria for ranking include popularity of the app, the number of downloads, reviews, etc.
Thus, mobile app developers can estimate the possible growth if they develop an app within this or that niche and can predict possible profit from releasing such app. It allows developers to move in the right direction in order not to create useless apps which nobody will install. Also, there’s always a possibility of custom mobile development (or, in some cases, modifying an existing one), which includes creating a new design for an app, then the app will be coded for certain platforms (alternatively, it can be cross-platform), and after that it will be tested to make sure that everything works perfectly.