What's the best tool for UI animations and prototyping?

There are so many tools now to produce UI animations and prototypes which range from basic click through prototyping (Marvel) to more complex prototyping with fancy animations (Framer), Which tool have you been using the most and why?
Scott StephensProduct Designer, The App Business · Asked

5 recommended

2
Kite Compositor

A UI animation and prototyping application for Mac & iOS

Kyle HessFintech Product Manager · Written
Just featured today. It seems really sweet, although I haven't used it too much yet.
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2
Framer

Prototyping tool for animation and interaction

Might be a bit hard to start if you are non-coder but it's the best one out there as there is no limit on what you can do.
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2
Principle

Animate your ideas, design better apps

It's super simple and easily customisable. There's also quite a few resources available for it.
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1
Atomic.io 2.0

Ultra fast, scalable and fully collaborative prototyping

Kunal Bhatia22Co-founder & Design Lead @SlidesUp · Written
I'm constantly impressed with the team at Atomic. I'm able to scale the fidelity of my prototypes really easily from low to high. Their recent additions like components, data, and team collaboration tools make it really powerful. You can see a more in-depth review in my Medium articles on "The New Generation of Prototyping Tools" Part 1 and Part 2.
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1
Origami

A free design prototyping toolkit for Quartz Composer

Jason CoudrietDesign Leader, @schoolwires @blackboard · Written
Though with a bit of a learning curve, extremely powerful with outstanding support from Facebook and the community.
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