Probably the best frame by frame animation software on any platform
Ive tried every animation software on the market for both iOS and desktop computers. Everything from the venerable TVPaint to open source alternatives like Pencil2d.
I have to say that Animation Desk Cloud, with its new "cleaner" user interface that does away with trying desperately to look like a traditional animation desk, does the best job of simply getting out of your way and letting you focus on the animation. Of course it doesnt have all the extra bells and whistles of a studio grade tool like Toon Boom, but it has all of the tools you need to visualize a sequence, which you can then export to another drawing application if you prefer.
My only complaint is that the brushes/pencils arent as nice as in dedicated drawing apps such as Sketches Pro, and it lacks some handy features like gesture-based undo.
Overall its a solid platform to rough out your ideas and then export them to another drawing app once you have the timing and spacing nailed down.
Id recommend this software for anyone whos interested in traditional 2d animation. Just be sure to get this version and not the one that looks like its trying to emulate an actual desk.
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Animation Desk® Draw & Animate, v5.6