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The tools we’d recommend you look at first are Sketch, Figma, Balsamiq Mockups, Framer X, and UXPin. However, there are a crazy number of good alternatives, including…taking a very deep breath…Adobe Brackets, AppCooker (for iOS apps), Appery.io (outputs code for mobile and responsive apps), Atomic.io, Axure (a complex, sophisticated wireframe tool suite), Balsamiq Mockups, Canva, Craft, Creately, draw.io, Fireworks, FlairBuilder (for apps), Flinto and Flinto Lite, Fluid (
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Karl Blanks (Making Websites Win: Apply the Customer-Centric Methodology That Has Doubled the Sales of Many Leading Websites)