Principle
Animate your ideas, design better apps
Principle launched on August 18, 2015 with 333 votes, #30 of 3,588 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 11 years on.
In plain words
Principle is a design tool that enables designers to create animated and interactive prototypes for mobile apps and web interfaces. It allows users to design multi-screen app flows, interactions, and animations across iOS, iPad, and Mac platforms, then share working demos with their teams. The software features a timeline-based system for controlling animation timing, easing, and motion effects, making it accessible for both simple animations and complex, multi-screen application designs.
written from the facts on this page · September 2026
From the sources
Principle is the simplest way to animate your app prototypes. Whether you're designing the flow of a multi-screen app, or new interactions and animations, Principle lets build designs for every platform and immediately demo them for your team.
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. 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. 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;…from principleformac.com
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Principle 2.02016 · principleformac.com · ▲199Animate your ideas, design better apps, now with components
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