Principle 是前 Apple 工程师打造的一款交互设计工具，五分钟即可制作出一个具有完整交互动画的原型，并且可将交互动画生成视频或者 Gif 分享到 Dribbble、Twitter 等社交平台。此外 Principle 还支持多种尺寸的原型设计，包括 Apple Watch。

[Principle 在官网上售价99美元，约合人民币600元]

Animate Your Ideas, Design Better AppsPrinciple makes it easy to create animated and interactive user interface designs. Whether you're designing the flow of a multi-screen app, or new interactions and animations, Principle lets you create designs that look and feel amazing.Built for the Biggest ImaginationsThere are a lot of things you might want to design: a short animation, a slick interaction, or an extensive multiple screen app. No matter what you're doing, you can do it with Principle.

Totally New, Yet Immediately Familiar

With artboards, magic animations and a timeline, using Principle will give you Déjà vu.

Touch Your DesignsPrinciple Mirror lets you interact with your design instantly on device or view designs that others have sent you. Coming Soon - In App Store ReviewDesign For Any SizeChoose a device preset or enter a custom Artboard size. Whether it's web, desktop, mobile, or watch — you're set!