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It combines the efficiency of Reverse Polish Notation with the visible structure and reactivity of a spreadsheet. You enter numbers and operators step by step, and you can retroactively change any value. All dependent calculations update immediately.
I love spreadsheets but I've never liked how cramped traditional spreadsheets feel on a phone. My goal was to make ad‑hoc, spreadsheet-like calculation on a phone feel direct and fluid.
Here’s a short demo: https://youtu.be/M0HwzrGGuyc
App Store link: https://apps.apple.com/us/app/gridcalc/id6759011187
Happy to answer questions.