AddUp 2 provides a great deal of flexibility through its "tape calculator" metaphor. Instead of the standard one-line display you find in hand-held calculators and in most available calculator programs, you get a complete work area that behaves like a regular text editor. Your past calculations simply scroll out of sight, but they remain available for review. Just like a tape calculator, you only need to scroll back up to see what you have done.
This tape metaphor offers more than just a tape. You can actually go back and change your past calculations since the tape is in fact a fully-functional work area for calculations. Type directly in the work area to enter expressions that you want to evaluate, then edit previous calculations and re-calculate them with new values.
You can also cut and paste anything you want as if you were using a regular text editor. You can stretch the window to any size: shrink it down to a small utility window stashed in a corner of your screen, or maximize it full screen for complete editing flexibility.
You can even save the content of the work area to a text file in plain text (.txt) or rich-text (.rtf) format. You can do this manually whenever you need to, or have it done automatically when you exit the program. Reload saved content the same way in order to continue working where you left off. Past calculations can always be modified and then recalculated after you restored your work.
Given this editing flexibility, you hardly ever need to use the calculator buttons. Just type what you mean! Buttons remain convenient to have though, at least for reference purposes.