Principle

Design tool for Mac that lets you create animations and interactive user interfaces.

Description

Principle is a designer tool that lets you build interactive designs, such as prototypes. It can include multi-screen flow, interactions and animations. As you use Principle to build your mockup and then turn it into an interactive design, your Principle prototype looks a lot more realistic (i.e. like a real website or app) than using tools that allow you to upload full screenshots that then get connected together.

Price
$$$

Purchase for $129.