Information technology affects our personal, social and public life and has made a significant impact on the quality of life itself. The use of information systems affects the improvement of efficiency and effectiveness of a whole set of business functions and processes in a way that enables better quality of communication and coordination with all stakeholders, it also facilitates administration, reduces distribution and communication costs, helps in opening up new and unknown markets, and provides up - to - date information that is necessary for timely reactions to any changes we might face. The development of mobile operating systems has been ongoing for a long time, and because of their complexity, it is still in the process of development. Mobile operating systems combine personal computer operating system features with features that are necessary for manual or mobile use. Today, the most used operating system is Android, it is even more popular than the Windows operating system that is used on computers. Accordingly, up to 80.7% of mobile users use Android. As for other operating systems there is also the iOS mobile operating system, which is in fact Android's biggest competitor. For the purposes of the final assignment, operational systems are described throughout the paper, with an emphasis on detailed analysis and comparison of the Android and iOS systems, which are the leading operating systems on the market.