Reminiscent of a web browser, each calculator has a Home and Back button, which means you're never more than a tap away from the Main Menu. I liked the way the calculator screens displayed information and the fact that you could customize the function of the buttons to suit your needs. All these things, and the fact that it installs completely in less than 250k makes CoolCalc a winner in my book. CoolCalc's Main Menu lets you select a business calculator, a scientific calculator, special formulas you have configured, or the Programmers Guide . A lot of care and attention has been paid to small details often overlooked on similar products.
Proficiency is easy to use, and has a comprehensive, but uncluttered display area.
As mentioned above, Proficiency is an RPN calculator. The other popular notation is Algebraic. Proficiency always displays the RPN Stack, letting you see the intermediate processing. All functions are available either way. Tabbed pages organize functions into logical groups.