About: One on One is an application that gives opportunities to enjoy ballet lessons represented as video-trainings and recommendations based on a machine-learning comparison of videos created by a coach and a learner. Challenges: The New Line Technologies team faced the following challenges: Create an assistant-app for online ballet training; Integrate machine learning model into the application; Provide interaction of native models with the Flutter based app; Develop an algorithm of identifying video-image and its representation as a heatmap object created by analysing video-recording from different angles; Optimize the productivity of the application on modern devices; Develop the mechanism of video-training purchases. Solutions A digitized educational database has been created; A unique application for conducting remote ballet training has been developed; The interactive system based on machine learning helps analyze and correct learner movements by recording and comparing them with master movements side by side; The integrated machine learning model for calculating accuracy and providing recommendations based on it; Added option to create learning patterns by dividing each exercise into multiple fragments and setting up repetitive playback; Implemented app optimization on iOS and Android devices. Results One on One is an absolutely non-trivial product that gives great opportunities to participate in ballet-lessons right from home without the need of attending a studio. The application is an indispensable solution for both teachers and learners who are not able to take classes for certain reasons but want to keep up.