Principle

What it does

Principle is a Mac app for building animated, interactive UI prototypes with a focus on making transitions and micro-interactions feel smooth and realistic. Finished prototypes can be shared as a link. It's a one-time-purchase, single-developer product rather than a venture-backed platform.

Who this helps

You design animated UI transitions on a Mac.

You want micro-interactions to feel realistic.

You want to share prototypes as a link.

You prefer a one-time purchase.