keyCulator is the simplest calculator software in the world. However, the simplicity is both a concept and a power! This is the only calculator software without a program window. Actually, there is no window at all!

Features: keyCulator is a simple calculator software. It does not need a separate program window or any complicated interface. It works with the program that you may be using at that time. It can add this calculator functionality to any running program at all. It does work standalone too. Supposing you need a calculation to be shown in a Word document and have the calculator running. Typing 2+2 and hitting the = sign will automatically produce the string 2+2+4. If you do not need the 2+2 string that can be done too and only the result entered into the document. You may want to a calculation and then comeback into the document. All these options are available with this calculator.

When running, all you need to do is press the NumLock button. The numeric keypad becomes the calculator keys. The enter key becomes the = key. For calculations outside any other program simply enter numbers and operators as you would with any calculator. As soon as you hit the = key the expression as well as the result is shown in the hint window at the bottom of the screen. You can continue to do calculations with the results of the first step. Simply use the operator of the next level and continue normally you will keep getting results as they are calculated with the result of the earlier stage, the new operator and the new number at the current level.

Overall: Nice and easy to use program. Though for a very simple purpose it does the job well.