By Johnson Tsay

  • Category: Education
  • Release Date: 2020-07-31
  • Current Version: 1.0
  • Adult Rating: 4+
  • File Size: 1.51 MB
  • Developer: Johnson Tsay
  • Compatibility: Requires iOS 13.4 or later.



The major functionality of this app is to provide a software abacus on your iPhone so that you can play with that without carrying a physical abacus. The app also introduces how to correctly use thumb and index finger to move beads and some important concepts like ten's and five's complement to support arithmetic operation. This app also gives you some basic addition samples to help you how to operate your abacus to reach the right answer for related operations.