Abacus Exercise is an educational app developed by Hirokazu Komatsu for the iPhone. This app aims to provide a smooth and comfortable experience while using an abacus on your device. With its user-friendly interface, it allows users to freely customize the size and position of the abacus according to their device.

One of the standout features of Abacus Exercise is its flexibility in terms of the number of digits that can be used, with support for up to 15 digits. Furthermore, users have the option to customize the color and sound of the beads, adding a personalized touch to their abacus experience.

The app also offers a range of challenges, allowing users to test their skills in addition, subtraction, multiplication, and division. With different difficulty levels available, users can choose questions that match their proficiency.

Abacus Exercise is a free app available in the Education & Reference category on the iPhone platform. It provides a convenient and interactive way to practice using an abacus, making it a valuable tool for anyone interested in learning or improving their skills in this traditional calculation method.