Having a back button to erase one number instead of starting over is how stock calculator app should be. Stupid thing is you have to write a review and give it 4 stars to be able to use the history feature. Oh well it's what I was looking for so here's my review.

You have to comment and give five stars to use the history function? This seems like it should be a violation of apple’s app policies.Update: so far the app is fine. There is an odd thing where if you go to calculation details then try to copy a number or equation, instead of the “copied to clipboard” being in English, it’s in a different language. I updated my review to a 4, because blocking users from the full app by telling them they have to review it 5 stars seems wrong. You don’t have to rate it 5 stars to access history, it’ll work with any rating.

Can't use the history on the calculator without 5 stars and a comment. Sure do like that history though...

App require 5 stars for history function, however looks good so far.Update not all buttons available in portrait mode even when this option is selected