Sketch.systems

For product designers and teams working through complex interactions, Sketch.systems helps make a product’s behavior easier to describe and discuss before implementation. Write a simple, Markdown-like specification of states and event-triggered transitions; the app turns it into an automatically updated statechart. Click events in the diagram to step through possible flows, and use nested or parallel states to organize behavior. Add an optional interface prototype to show what the product might look like in different states. Prototypes can be built with JavaScript, HTML, and CSS, or use attached images and screen mockups. Save sketches to share with collaborators in design, engineering, QA, product management, or client teams. Sketch.systems is intended for high-level modeling and communication, rather than production implementation or automated statechart analysis; it does not support transition guards, actions, or extended state variables.

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