📊 Build the Calculator Your Spreadsheet Has Become

I have a spreadsheet that half the company asks me to send them, and there are now several versions of it. Build me a calculator app to replace it. Separate the two kinds of data clearly: the inputs a user types each time, and the rates, factors and thresholds that only I should be able to change, kept as their own editable records. Produce the same result the spreadsheet does, but save every calculation with the inputs, the result, who ran it and when, so it becomes a record rather than a throwaway. Give it a link people open rather than a file they copy. Add an AI agent that explains any saved result to someone who did not build the model, describing what each input did to the answer in plain language. Automate a scheduled monthly summary of how often it is used and by whom, so I can see whether it is doing its job. Two logins: a general user who can calculate and see their own saved results, and an owner who maintains the rates and sees everything.