Soroban Dojo

Learn soroban, the Japanese abacus, and train your mental math with short, progressive and motivating exercises. Soroban Dojo turns arithmetic practice into a daily training loop: guided lessons, timed drills, level progression and duels to stay engaged. Features: • Step-by-step lessons to understand beads and columns • Mental math exercises adapted to your level • Training mode to improve every day • Duels and challenges to test your speed • Progression inspired by the Kyū/Dan system • Clean, fast and distraction-free interface Ideal for learning soroban basics, improving concentration and making mental calculation feel more natural.