STEM careers are constantly facing challenges and changes, but currently, the main problem lies in the low participation of women worldwide. From the above mentioned, the purpose of this project was born, which seeks to solve this problem through a mobile application that motivates and develops skills and knowledge about STEM. This application has two interactive modules to obtain a more significant attraction in girls. The first is called "Motivate yourself", which contains videos and motivational phrases to publicize the experiences of successful and empowered women who have studied STEM. On the other hand, the second module, "Learn while playing", provides us with various interactive games that test their knowledge to enrich the girls' learning about STEM-related topics. These modules were created based on the M-Learning method that focuses on learning through digital platforms. While for the application's architecture, the Scrum methodology is used, which is based on fulfilling tasks with a development team for short periods called "Sprints," using the open-source software React Native with its JavaScript programming language. After developing this application, a pilot test was implemented where the design and content were evaluated, and corrections and improvements were implemented according to the results. Finally, it was possible to create a motivational tool for adolescent girls who are often afraid of studying careers of this type, either because of a lack of knowledge or because they do not feel they have the skills to carry them out.