Man, I remember my Dad excitedly showing me Visicalc on our Apple II when he came home from working at Kodak. He loved it and I remember playing with it a bunch as well. There's something pretty magical about it.

And I still think there's room for innovation. Not something cloud-based, but something that lies in the middle between a classic spreadsheet, and other concepts like Jupyter or the Mac's "Calca" app.

What I don't like about spreadsheets is that you can't document them, like literate explanations about what the calculation is or why. You can do that in Jupyter documents, but bringing in reactive calculations to Jupyter is still a very hacky affair, akin to invoking "recompile entire document" after every adjustment.

If I could have something that was more like a spreadsheet, meaning reactive calculations as a first class concept, but still one step away from the grid UI with room for documentation and explanation, I'd be very happy. Literate Spreadsheets, basically.