GridCalc – Combines RPN and spreadsheets for mobile calculations

Summary: GridCalc merges Reverse Polish Notation with spreadsheet structure on iOS, enabling step-by-step calculation building and instant recalculation when editing values. It offers a grid-based execution model driven by an RPN stack, allowing persistent intermediate results and retroactive input changes.

What it does

GridCalc lets users enter values and operators sequentially in a grid, storing intermediate results in cells and recalculating automatically when inputs change.

Who it's for

It targets engineers, finance professionals, and experienced RPN users seeking structured, mobile-friendly calculation tools.

Why it matters

It solves the limitations of cramped spreadsheets and single-expression RPN apps on phones by combining both approaches for fluid mobile calculations.