The Abacus App is a free educational tool developed by TezSoft for Android devices. It offers six types of abacus, including soroban, suanpan, binary, Russian, school, and rekenrek, as well as the ability to customize the number of rods on each abacus.

This app is perfect for anyone looking to learn or practice using an abacus. The different types of abacus allow for a variety of learning experiences, and the ability to adjust the number of rods ensures that users can start with a simpler version and progress to a more complex one as their skills improve.

The interface is simple and easy to use, making it accessible for users of all ages. The only downside is that there are no tutorials or instructions included within the app, so users may need to seek out external resources to learn how to use an abacus effectively.

Overall, the Abacus App is a great tool for anyone looking to learn or practice using an abacus on their Android device. With its variety of abacus types and customizable rod numbers, it offers a comprehensive learning experience.