iSmartCalc is more then just a simple calculator, it has a powerful scrollable history that allows you to see your old calculations and results, but you can also select old equations and results and build on them. Also, iSmartCalc supports variables so you can reuse values easily. In iSmartCalc we have a bunch of built-in functions for use in your equations but the true power of iSmartCalc is the ability to define your own functions. 

Features
* large simple interface
* scrollable history 
* variables
* Scientific functions
* Custom functions