UML Diagram Generator

Draw the right UML diagram — class, sequence, state and more.

Produce UML diagrams — class, sequence, activity, use-case, state machine, component, and deployment — as editable Mermaid and/or PlantUML source, picking the right diagram for the question and following disciplined layout. Use when asked for a UML diagram, class diagram, sequence diagram, state machine, or to model classes/interactions/behaviour.

Ask for it in plain English, e.g.

Works in

You ask: Draw a UML class diagram for a simple library system: a Member can borrow many Loans; each Loan is for exactly one Book copy; a Book can have many copies. Members and Librarians are both People. Show the relationships and multiplicities.

Example output shown for illustration. Your assistant produces this live from your own request once the skill is installed.