Animate Your Ideas, Design Better Apps

Principle 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 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.

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 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

Touch Your Designs

Principle Mirror lets you interact with your design instantly on device over a fast Lightning connection. You can also email designs to stakeholders and Principle Mirror will open the attachment.

Get Principle Mirror

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

Apple
Cartoon Network
Facebook
Google
The Home Depot
Amazon
Starbucks
Nike
Adobe
Cooper
Netflix
Microsoft
Lyft
Huge
IDEO
Nest
Etsy

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 The Free Trial

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