
Its ease of use and preview features are awesome. I use it's plugin for Sketch and upload my designs with one click, no matter if it's for mobile, web or any other platform, Marvel's got you covered. Plus, if you are a developer, each uploaded file will automatically give you the UI elements size, coordinates and color along with its CSS code. It also has a very intuitive and powerful app (although I've only used the iOS one). Review collected by and hosted on G2.com.
For its free version you can only have one project, which probably won't be enough if you have many ideas in mind. Its user capacity is also pretty restrictive not only for its free tier but also for the cheapest one (only 1 user) but this increases to 3 for the "Team" plan. Review collected by and hosted on G2.com.

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