account 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. download buy $129 or renew, or add seats principle 6 — now with share to web share your designs with one click. learn more built for the biggest imaginations there are a lot of things you might want to design: a short animation, a slick interaction, or an extensive multi-screen app. no matter what you're doing, you can do it with principle. animation principle's timeline makes it quick work to illustrate the perfect bounce, ease, and pop. interaction want to design a totally new interaction? principle gives you the freedom to experiment without limiting you to pre-defined