The app can memorize hundreds of digits in no time, even if you don't know them by heart.

There are multiple ways to train. You can choose to be memorizing by heart, or by trial and error.

The app is fully customizable. You can set the time to train, the interval, the mode to train in (e.g. random, order, or timed), the type of training (e. by heart, by trial and error, or manually), and the keyboard.

This app includes an optional in-app-keyboard, as the Android number keyboard has another layout than the calculator you might be used to.