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
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.
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.
With artboards, magic animations and a timeline, using Principle will give you Déjà vu.
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.
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.
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!
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.
"This. is. amazing. While I was watching the first tutorial I got tears in my eyes! Seriously."
"Principle is by far my favorite prototyping tool"
"I’m seriously in love with Principle, it’s even easier than I expected."
"This tool is amazing, very well done."