The Русский язык. Орфография app is a comprehensive program designed for both adults and children. It is an educational tool that teaches Russian spelling and is divided into chapters and rules. Each rule is taught using a multi-step process, including reading and analyzing the rule, practicing by identifying the correct spelling of a word, and taking a final exam to test the material learned.

This app is perfect for practicing spelling in grades 1, 2, 3, 5, and 7. It contains over 15 rules of Russian spelling and offers more than 1,100 words for practice. It also has various training modes, and users can take exams chapter-wise or for the entire app. In the future, the developers plan to structure and add all the rules of the Russian language with training for each rule.

Overall, the Русский язык. Орфография app is an excellent tool for learning the basics of Russian spelling. Spend just 15 minutes a day practicing, and you will notice significant progress by the end of the week.