Easy to create transitions from one state to another
Animation panel. By default, an easy-in / easy-out effect will be applied to each animation, which you can easily configure yourself
Intuitive interface thanks to Mac OSX native interface elements
Super-visualized prototyping method
There is a timeline for conversions
There is a preview in the desktop application
Principle is an application for Mac OS that allows you to create animation of UI elements in two accounts and generate its interactive prototype. Whether it is a multi-screen application or a control you just invented. This product is a clever mix between Sketch, Keynote, Flash and After Effects (plus some cool features for interactive prototypes). Everything seems very familiar. If you worked with Sketch, you can easily figure out the Principle: inspector, list of layers, artboards.