The aim of this thesis is the comparison of development tools between Android Studio, Xcode and Xamarin Studio. All three environments enable the development of mobile applications. Mobile devices that use the operating systems Android and iOS dominate the market and popularity among users. The goal of applications is to support both leading operating systems and allow equal functionality to all users of mobile devices. In practical part of the thesis we will develop an application for the Android operating system using Android Studio. Xcode environment is intended for developing iOS applications, which will also be presented in the practical work. Both of these environments are specifically created for the development of applications in on...