Columny is an educational app designed to help children and students practice written calculations in a clear and structured way. The app focuses on column-based arithmetic and allows users to train: β’ addition β’ subtraction β’ multiplication β’ long division Columny guides users step by step, just like solving problems in a notebook. Each entered digit is checked immediately, helping students understand mistakes and learn correct procedures. Key features: β’ Unlimited automatically generated problems β’ Step-by-step support for multiplication and long division β’ Instant feedback for every entered number β’ Custom problem input β’ Works fully offline β’ Designed for both iPhone and iPad β’ Clean interface focused on learning Columny is ideal for school practice, homework, and independent learning.