When comparing Animation Desk vs Keynote, the Slant community recommends Keynote for most people. In the question“What are the best tools for prototyping mobile interactions/animations?” Keynote is ranked 7th while Animation Desk is ranked 19th. The most important reason people chose Keynote is:
Can import all kinds of assets (images, videos, PDFs, sounds) into mockup without hassle.
Specs
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Pros
Pro Quick sketch
Great for light sketches, and some drafting for your animation.
Pro Free to use
Some features may require purchases but the app free as is, and works fine.
Pro Works on different platforms
It supports almost every major platforms, so working on iOS, Android, and Windows devices is not a problem.
Pro Photoshop compatible
Supports PSD file import/export, can export your draft to Photoshop easily for further works.
Pro Imports nearly every type of asset
Can import all kinds of assets (images, videos, PDFs, sounds) into mockup without hassle.
Pro Animations and transitions
Keynote currently is one of the very few tools that supports animation of elements and transition of views without programming.
Pro Text Styles makes it easy to create typography systems
Pro Smart Snaps
Keynote has alignment grids (aka snap to grid feature) that snaps to end, midpoints, baselines etc of objects and grids. They are super useful when you want to follow a structured layout for your wireframe.
Cons
Con Android version is not as extensive as the iOS version
Some of the options that are present in the iOS version of Animation Desk Cloud aren't integrated in the Android application. For example, features such frame labeling isn't available.