Great App Works flawlessly!
Nice feature set, needs some refining This has features to keep the screen from going of, shake to reset or not, turn sound and vibration feedback on or off. I did find it hard to move the beads I wanted to move. Perhaps fwere rows and bigger beads or just greater accuracy and speed in moving the beads would make this work better. It has great potential, but needs polish.
The best of the free abacus apps. Only two complaints. 1. Sliding the beads is a little tricky. Sometimes I inadvertently slide more or fewer beads than I intended. Since there's no animation behind the bead sliding it's not clear what I've actually done until after I've finished. 2. I wish there was a way to turn off the numbers above the abacus. I'm trying to learn how to quickly read an abacus and those are getting in the way.
Issues You WILL want to turn vibrate off, and most likely the sound too.