Axure RP

Axure RP is the industry standard for high-fidelity prototyping, allowing UX designers to build complex logic, conditional flows, and data-driven interactions without writing code.

Axure RP bridges the gap between static design and functional development. It excels where basic hotspots fail: using variables, conditional logic, and dynamic widgets to simulate real application behavior. Teams at Amazon, Microsoft, and Salesforce use it to validate complex user journeys (like multi-step forms or sortable data grids) before a single line of production code is written. The tool includes integrated documentation features and SVN-based team projects to keep enterprise-scale design systems synchronized.

https://www.axure.com