Rapid prototyping involves quickly creating mockups of systems or applications to validate designs with stakeholders. Axure RP is a tool that allows creating wireframes, sketches, mockups and interactive prototypes on desktops with collaboration options. It has wide capabilities, is easy to learn, and costs $289/$589. Axure RP allows organizing pages in a sitemap, formatting pages and widgets, adding interactions through cases and actions, and generating specifications and site maps. It also enables collaboration through sharing and editing projects simultaneously.