Over the past 10 years, the number of smartphones used has exceeded 2.5 billion. Every year, consumers spend $380 billion on new devices. Each of them has applications that simplify life, helping to count, communicate, and order a taxi or food.

A mobile app itself is application software developed for smartphones and tablets with various operating systems: iOS, Android, KaiOS, Harmony OS, Tizen, and others. In most cases, it requires access to the Internet if it is connected to remote resources.