Introduction The popularisation of mobile devices has been considered by many to be the technological revolution of greatest impact in recent years. Thus, the development of computational solutions in the form of applications for mobile devices represents an effective means of making available health education contents for adolescents. The objective of the study was to describe the development of the application Adolescent Chat with information on sexuality and STD/HIV/AIDS prevention.

Methods This is a research and methodological development, carried out in 2016. In this study, an application was developed based on the website already developed, Adolescent Chat, containing subjects on sexuality and STD/HIV/AIDS prevention as a tool to promote Adolescents that attend the Catholic Church. Ethical aspects were respected in accordance with protocol No. 1.165.118.

Results The application was developed in the Engine Unity that allows platform portability and friendly interactions from the definition of visual contexts aligned with the target audience, adolescents and young Catholics. The contents selected to be placed in the mobile application were selected from the contents of the Adolescent Chat site, and focus on the themes of Sexuality, STD/HIV/AIDS and STD Prevention. The contents were developed and validated in a previous study. In addition to the presentation of explanatory content, the adolescent has the option of interacting through illustrations, animations and quizzes.

Conclusion The relevance of this study is therefore acknowledged, since it is focused on the development of an educational technology in health in the virtual format, aimed at adolescents, using recreational methods that favour critical reflection and, consequently, adoption of safe sexual behaviours. The importance of the application as an instrument of health education is highlighted, enhancing the actions of STD/HIV/AIDS prevention, solidifying the interdisciplinary practice, mainly aimed at improving the care of adolescents.