Mainichi: Unique 2-in-1 calculator app adds up to surprise hit for retired engineer in Japan

Mainichi: Unique 2-in-1 calculator app adds up to surprise hit for retired engineer in Japan . “The double calculator app allows users to move the computation results of one calculator onto the other by tapping arrow keys displayed on the middle of the screen. For example, if a user calculates ’89 x 15 = 1335′ on one calculator and taps the arrow key, the result ‘1335’ will be displayed on the other calculator, allowing the user to continue a problem while the previous equations are still shown on the screen. This makes it easy to notice errors. It is also possible to perform different computations on each calculator.”

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