Modern teachers and the managers of educational establishments have big challenge – to organize the lectures and the study process so that the students are provided with the necessary skills and to meet their educational needs, as well as their parents’ expectations. An integrated lesson that is developed with a synthesis of information on different educational subjects stimulates the students’ analytic thinking, which in exchange boosts the integral perception of the reality. That is why STEM-lessons are becoming more and more popular among the educators, as far as the specifics of this approach can really solve a lot of tasks. Modern IT-developments are an appropriate T – component during STEM-lessons and while developing STEM-projects. One of these up-to-date trends is called Augmented Reality (AR), which allows visualizing the study material and improves its reception and memorizing. The purpose of the research is development of a mobile app (on Android) for STEM-lessons, designed for visualization of the chemical structure of organic, biologically active substances, which can be used by the teacher and students in order to carry out integrated lessons of biochemical area; revealing key specifics of using STEM-technologies while studying natural sciences.