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 lets you create designs that look and feel amazing.

3.0 Update Now Available

The largest update yet adds Message Events, Color Drivers, Lockable Layers, Animation Preview, Image Export, and more. Just a few more reasons to love Principle.
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 multiple screen app. No matter what you're doing, you can do it with Principle.


Principle's timeline makes it quick work to illustrate the perfect bounce, ease, and pop.


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.

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.

Use hover events to create desktop and web designs

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

See What's Possible

Amazing work is done in Principle every day. Go to Gallery

Lights. Camera. Interaction.

Showing your designs has never been simpler with the record feature: Export a 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.

The Best Design Teams use Principle

Cartoon Network
The Home Depot

Designers Love Principle

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

Hugo Ahlberg
Designer, IDEO

"Principle is by far my favorite prototyping tool"

Lucy Guo
Designer, Snapchat

"I’m seriously in love with Principle, it’s even easier than I expected."

Alan Roy
Design Consultant

"This tool is amazing, very well done."

Patrick Wong
Designer, Lyft

Download and Try for 14 Days

Try Principle for free for 14 days. Only days that you actually use are counted.