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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.

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Principle 4 Now Available

Take control of your designs with slow motion preview, animation scrubbing, video control, curve presets, and a rewritten video exporter.
See What's New

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

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Want to design a totally new interaction? Principle gives you the freedom to experiment without limiting you to pre-defined transitions.

Multiple Screens

It's a breeze to design the flow of a multi-screen app; and when you're done you'll have a bird's-eye view of all your screens.

Totally New, Yet Immediately Familiar

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

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Pick Up Where You Left Off

Import your designs from Sketch with a simple, one-click importer. Your Sketch designs will apper in Principle, ready for you to breathe new life into them.

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Design For Web, Desktop and Mobile

Choose a device preset or enter a custom Artboard size to design for your favorite platform. Hover events and mouse wheel scrolling make it easy to make web and desktop prototypes that feel like the real thing.

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Share Your Designs

Principle Mirror for iOS lets others view your designs on their device. While designing, you can interact instantly by plugging your device into the computer. You can also export a standalone Mac app for others to view.

Get Principle Mirror

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Lights. Camera. Interaction.

Showing your designs has never been simpler with the record feature: Export a Ties Gift Mens Unique Flames Baseball Crocodile Fashion Neckties Silk Alligator video or an animated gif that can be shared on Dribbble, Twitter, and wherever else you'd like!

Built for OS X

Principle is powered by Core Animation, the hardware-accelerated animation engine that iOS and OS X are built on. It also includes the Mac features you love: Full-screen mode, a Retina interface, and Auto Save — so you'll feel right at home.

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Designers Love Principle

"This. is. amazing. While I was watching the first tutorial I got tears in my eyes! Seriously."

Hugo Ahlberg
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Designer, IDEO

"Principle is by far my favorite prototyping tool"

Lucy Guo
Designer, Snapchat

"I’m seriously in loveRed Necktie FYios Men's tie Striped Tie g0xq6wIx with Principle, it’s even easier than I expected."

Alan Roy
Design Consultant

"This tool is amazing, very well done."

Patrick Wong
Designer, Lyft

See For Yourself

Try the full version of Principle for free for 14 days. Only days that you actually use are counted.