Fluid UI is a browser-based wireframing and prototyping tool developed by Fluid Software and used to design mobile touch interfaces.
License: Freemium
Fluid UI is best for quick prototyping with its intuitive interface and real-time collaboration, while Moqups offers more versatility with design and project management tools. Both tools cater to different needs: Fluid UI focuses on rapid prototyping, whereas Moqups is more suited for comprehensive design workflows.