Calcstack lets you build technical and visual documents through AI prompts. You can generate flowcharts, system diagrams, AI agent workflow maps, formatted CVs, and interactive circuit simulations without starting from scratch. It's aimed at developers, engineers, and technical professionals who need quick visual outputs from natural language descriptions. The interface handles layout and logic automatically, so you can iterate fast rather than drag-and-drop your way through a blank canvas. Comes with a free trial and straightforward paid plans.