Napkinbook brings computational notebooks to an infinite whiteboard canvas

Napkinbook lets you mix live code cells, calculations, and freeform notes on an infinite whiteboard — think Jupyter meets a spatial canvas. For indie makers who sketch out data models or quick analyses, the ability to lay out computational work spatially rather than linearly could meaningfully change how early prototyping feels. It's a solo-built tool targeting a gap between notebook environments and visual diagramming apps.