The best alternatives to Proof are Craftwork Design, Zen Flowchart, and UXFlow. If these 3 options don't work for you, we've listed a few more alternatives below.
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High-quality UX/UI and Wireframe Kits, Illustrations, Templates, and Mockups to make your design workflow faster and easier. Craftwork is a small team of designers and developers. We create our own design stuff and follow new cool products around the internet.
User flow kit for Sketch and Figma. It helps creating sitemaps really fast and easy for your team/freelance/agency or side projects. Simply drag & drop elements, add arrows, scale their width and height to get professional and beautiful sitemaps, wireframes or diagrams within minutes.
The clear way to share complex information. Coggle is a collaborative mind-mapping tool that helps you make sense of complex things. Create unlimited mind maps and easily share them with friends and colleagues.