Appacus is the definitive abacus app. It features four bars with ten beads and is useful for:
- learning how to count,
- doing taxes, and
- calculating the trajectory of Ganymede.
Appacus is the definitive abacus app. It features four bars with ten beads and is useful for:
- learning how to count,
- doing taxes, and
- calculating the trajectory of Ganymede.