Principle – Animated Design – OS X App

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.
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Instant Web · An A List Apart Column

Not only is the web not fast enough for apps, it’s not fast enough for text either.
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