Dersu is a lifestyle application designed for outdoor enthusiasts, focusing on mountain activities like hiking, snowshoeing, skiing, and mountaineering. It offers features to define your level, learn about mountain activities, practice with hiking and snow routes, and access offline maps with useful information along the way. The app allows users to create groups for planning trips, check weather forecasts by area and time, and receive alerts with relevant information during the journey.

Dersu provides a level system for mountain activities, considering technical skills, physical performance, and risk management. Users can progressively improve their skills and safety by defining their level accurately. The app also offers planning tools such as maps, waypoints, weather updates, and group coordination features for a successful mountain experience.