Crashes and unusable
I used to love this app, but now in ios7, it appears to be incompatible and no longer works. Where's the update, folks??
Thirteen columns at least
Greetings I like this abacus, but it should have at least thirteen columns on it or scroll up to a minimum of thirteen.
Hopeless
Do not buy about as good as a ashtray on a motorbike
Intuitive
Very good it helps me with maths loads but when my dad told me to get it I thought BORING! Then i realised how easy and effective it was to use