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In todays development is more important then ever to provide a best possible experience to users, this included non only best tested and performed code, but also a stunning user experience.

For this purpose developers and designers need tools to prototype and experiment with UI and UX as early as possible in the development cycle, so in recent years many tools for prototyping and designing UI come to market (Sketch, Adobe XD, Figma, InVision, etc...).

Could be really usefull if you release UI kits of your controllers for these tools (or at least for the most popular like Sketch and XD)