From the author of the original 1992 game "KYE", the TreeCel calculator was inspired by the shortcomings of the common spreadsheet programs.
The TreeCel calculator tries to improve things by:
1. Showing an expression and its results side by side
2. Using simple and clear constructs like IF and FOR.
3. Allowing structured data like arrays.
4. Using a tree-like structure.
5. Step by step debugging.