Atomic is a prototyping tool for both mobile and web designs. You can both design UI and prototype interactions and animations.
Ranked in these QuestionsQuestion Ranking
Pro Makes it simple to add basic interactions
Atomic is designed to be a fast and simple way to animate and add interactions to your designs. You can add swipe, hover, double tap, tap and hold and right click interactions.
Con Limited to very basic animations
If you want to do more advanced/polished animations to prototype what a polished app/website would feel like this isn't the right tool.