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Lucid Spec is a Windows application that helps you prototype and describe software user interfaces. It can reduce software development costs, improve user satisfaction, accelerate project communication, and clarify requirements.
Through a virtuous cycle of screen design, application simulation, and user interface description, you can rapidly prototype and define your user interface. You can even create a functional specification.
In addition to the regular Lucid Spec application, there is a separate Player application. The free Player allows you to simulate the application and view the documentation.