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.
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.
The best Marvel scenario is when you have an application that has different navigability options, and it is a long project. Marvel works to design these applications, as well as give a demo in the design to present it to customers and visualize how your application will be on the client side. This is an advantage for the whole team because the client knows what to expect, and the developer know what to develop. I also appreciate the logical order between options and navigation, which allows you to carry everything out very cleanly when working. Now, if there are projects that are short and do not have a level of design that requires you to present your application to a client in a visual way, it is not necessary to work on Marvel, since the ideal use of this application is to really see the scope of a project, to see in a visual way what will be presented and how it will look, and to see functions and features that will be available in some way when the application is developed. That is the great advantage of using marvel.
Marvel isn’t the most robust prototyping tool, but its simplicity is what makes the tool rise to the top when it comes to creating quick, simple prototypes to elicit feedback on designs and iterate upon them. While tools like InVision and Axure provide many tools to make more realistic, animation-heavy designs, Marvel is a go-to for a simple interface that enables designers to “just design.” Sometimes it is not necessary to have all of the bells and whistles of a stronger tool, particularly when a designer is low on time. Marvel’s simplicity allows designers to quickly design and iterate in time crunches without the distractions of fancy bells and whistles.
Creating prototypes of applications, or sites in marvel, guarantees me a considerable return, as it saves time and effort, because the client is quickly introduced to the various stages of prototyping, which avoids rework.
Another plus point, it's free!
No need to download programs, it's all done online.