#Prototyping.
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Axure RP
Axure RP builds functional UX prototypes with conditions, variables, forms, and responsive views so teams can test complex flows before development.
Balsamiq
Balsamiq is a deliberately rough wireframing tool for early product ideas, user flows, and alignment before visual UI design.
Marvel
Marvel creates clickable product prototypes for early user testing before design systems, accessibility, and production are fully implemented.
Proto.io
Proto.io builds interactive web and mobile prototypes with UI components, animation, variables, device previews, and controlled review without production code.