Fluid UI

Fluid UI is an in-browser wireframing and prototyping tool with a library of UI widgets for iOS, Android, and web. Users can link screens with gestures or transitions, simulating typical user flows. Real-time collaboration allows remote designers to co-edit and chat. Device mirroring helps test prototypes on phones or tablets. A free plan supports limited pages and projects, while premium tiers expand project count, team seats, and advanced features like user testing. Fluid UI’s emphasis on fast, intuitive prototyping appeals to small creative teams needing web-based convenience.