Soroban HD is an educational tool to aid in the study and mastery of the soroban (abacus). This application currently supports 2 types of abacus; The 1: 4 or single 5 bead and 4 1 beads typically used in Japanese studies and the 2: 5 or 2 5 beads and 5 1 beads often used in the Chinese studies. There are several modes of both type of abacus.