Calc Meister is an educational Android app developed by Chams Toutcourt, designed to enhance mental arithmetic skills through daily practice. The program offers training exercises focusing on basic operations like addition, subtraction, multiplication, and division, including exact quotient and Euclidean division. Users can also work on complements to 100 and 1000, as well as vocabulary related to mental arithmetic.

Ideal for 9-10-year-old students looking to strengthen their math skills or adults seeking to challenge and maintain their mental agility, Calc Meister features multiple difficulty levels. From numbers up to 1000 for additions, subtractions, and complements to tables from 1 to 30 for multiplications and divisions, the app provides a comprehensive range of exercises. Advanced levels delve into topics like multiples, divisors, squares, cubes, gcd, and lcm, offering a diverse learning experience.