The best alternatives to Ionic Sketch UI Kit are Shape Factory, lstore.graphic, and Brand.ai. If these 3 options don't work for you, we've listed a few more alternatives below.
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Velvet UI Kit an allusion to the possibility to combine to create new work. Is high quality pack based on simple and clean design, includes 70+ iOS screen templates designed in Sketch, most popular categories (Sign In / Sign Up, Walkthroughs, Menu, E-commerce, Profile, Social, etc).
Prime is the Premium UI Framework for Sketch that speeds up Design System creation. It helps to maintain consitency and design with the industry best practices.