Framer

The App Design App Flinto is a Mac app used by top designers around the world to create interactive and animated prototypes of their app designs.

Design Prototyping with Origami Studio Explore, iterate, and test your ideas. A new tool for designing modern interfaces, built and used by designers at Facebook.

A powerful animation and prototyping application for Mac & iOS Visually drag and drop layers to build complex interfaces on a WYSIWYG canvas. Add animations and tune them with the integrated timeline.

Animate Your Ideas, Design Better Apps Principle makes it easy to design animated and interactive user interfaces. Whether you're designing the flow of a multi-screen app, or new interactions and animations, Principle helps you create designs that look and feel amazing.