Fluid UI vs Proto.io

Fluid UI helps you prototype Android, iPhone, iPad or Windows 8 mobile apps with our custom libraries, or upload your own images for pixel perfect mobile apps. Preview your mockup directly in your browser or install the Android or iOS apps to test directly on your device. Share the mockup with clients, stakeholders and users and get invaluable feedback long before writing a single line of code.

Create fully-interactive high-fidelity prototypes in minutes that look and work exactly like your app should. Turn your wireframes and mobile mockups into amazing interactive prototypes. Filled with rich media, animations and touch events. Swipe, tap, rotate and examine your app inside out the same way your end user will. Share your prototype with colleagues and friends to collaborate and review.