Justinmind offer prototyping and interactive mockups for web and mobile apps, supporting interactive graphics, animations, and user testing, collaboration and feedback sharing, and requirements management.
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Proto.io
Score 7.0 out of 10
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Proto.io is a prototyping tool for creating interactive mobile apps.
It's best to make quick wireframes a lot easier and quicker than most tools out there. However, this is suited for basic design, wireframe, and prototyping but not for the advanced UI design, collaboration, or asset sharing. If you have never had prototyping experience, it is not so intuitive since you will have a learning curve that can take a while. As I said earlier, it needs to be more marketed and needs a lot more tutorials out there.
Proto.io is an excellent product for small to medium teams that wants to have a prototyping or wireframing tool that is easy to use, can be used in collaboration with others and will deliver superior results with less efforts than similar options in the market. I think it is not so suited for teams that don't have more complex prototyping needs. In this case, other tools that are even simpler could be a better fit.
Proto.io is web-based for one, which is a plus - Adobe XD is a desktop application. Adobe XD has some great features, especially for a free product, but from what I experienced Proto.io had way more tools and customization for creating interactive prototypes. Adobe XD is good for building prototypes that go from screen to screen, but Proto.io allows you to get much more detailed with that (every element on the screen can have an interaction).