Opening RetroCalc displays a help screen showing you how to change the background and calculator by simply swiping abve or below. After reading and closing that message, you recieve a calculator and a background. You can then change the background and calculator to fit your needs.
The calculators that come with this app are all as you might have guessed, old. Most likely due to copyright problems, most calculators have a slightly changed brand name. For example: Texas Instruments is Texas International but mean the same thing. However, the graphic designers must have had the real calculator close by because they are very similar.
Overall, I think RetroCalc is a great app and can be useful and at the same time, show off your iPad. And lastly, you, the reader have a chance to win one of three copies of this amazing app. All you have to do is leave a comment below and you will be entered to win. Winners will be selected on August 30th.