ChatUML

ChatUML targets the awkward first ten minutes of diagramming: you know the flow you want to explain, but dragging shapes and aligning arrows gets in the way. Instead you describe the system or process in language — who calls whom, in what order, and under which conditions — and the assistant produces a rendered diagram you can refine. The app is deliberately narrow in scope, focused on the diagram types engineering teams produce constantly: sequence diagrams for API and protocol flows, flowcharts for decision logic, UML class and use-case views, BPMN for business processes, C4 for architecture levels, and mindmaps for early structuring.

Because the diagrams resolve to text-based notation rather than an opaque image, they behave like code. You can review a change as a diff, keep the diagram next to the source it documents, and re-render after edits instead of redrawing. That matters for teams who want architecture documentation to live in the repository rather than in a slide deck that goes stale.

The site itself is intentionally minimal — the editor is built for a desktop screen and keyboard, so mobile visitors are greeted with a friendly notice pointing them to a desktop, along with a short video and links to learn more. ChatUML positions itself as a lightweight tool for developers, architects and anyone who needs a diagram before a meeting rather than after it.