History does not show in RPN

[dae]

Another Android app, RpnCalc, (free!) keeps track of the values and keys pressed. It is accessed by pressing a 'tape' button. It does not try to track any particular equation, so each "X" line is one line in the history. Something like this would be a boon, because you would be able to review for entry errors.

Here is a screenshot from the Google Play Store. If it becomes a dead link, just search for RpnCalc and scroll through the screenshots provided by the developer.

Screenshot of RPN history 'tape'