Know Abacus is a free Android app developed by Kittipong.M, aimed at helping children aged 5 and up learn about abacus, numbers, counting, addition, and subtraction. The app offers a fun and interactive way of tapping into the unexploited potential of children's brains and unleashing their mathematical capability.

With Know Abacus, children can learn to count using an abacus, perform addition and subtraction of 1-2 digits, and even multiplication and division of 1-2 digits. The app also offers mental math exercises, review lessons, and unlimited random lessons for continuous learning.

One of the standout features of Know Abacus is its colorful abacus, which can be customized to suit individual learning preferences. The app supports two-touch or multi-touch abacus modes, and is available in English, French, Spanish, Turkish, Thai, Arabic, Portuguese, and Russian.