EcoGuide: Russian Butterflies is a unique mobile guide focusing on the butterflies (Lepidoptera) of Northern Eurasia. With detailed information on 64 prevalent species, including photos and drawings of both male and female specimens, this app serves as an essential tool for butterfly enthusiasts. Users can access text descriptions covering appearance, life cycle, habitats, feeding plants, and conservation status. The app features 12 simple determination characters with 2-8 values each, making species identification easy and enjoyable.

The application is divided into five main sections: Field Guide, Atlas, Textbook, Manual, and Quiz. Noteworthy is its offline functionality, allowing users to utilize the app directly in nature without an internet connection. By utilizing the Guide, users can narrow down potential species to 2-3, then compare their findings with images and descriptions in the Atlas.