If you plan to make some simple animations, getting ibspaint and trying to figure out the sound in an animation app could work! (It's tedious though, and complicated) the only other thing avaliable is flip-a-clip, which is decent enough. Even fusing ibspaint into filpaclip works! But if your like me, and lose motivation instantly from a setback (like ads) than I would figure out an alternative. Animation is insanely hard for me with flipaclip, because I get demotivated so easily and lose my passion by ads lmao