Montage Prototyping is described as 'Rapid app prototyping with a user-generated library of components. No design skills needed' and is a Prototyping Tool in the category. There are more than 50 alternatives to Montage Prototyping, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux and iPhone. The best alternative is Figma, which is free. Other great sites and apps similar to Montage Prototyping are Lunacy (Free), Adobe XD (Paid), Balsamiq Wireframes (Paid) and InVision (Freemium).
Lunacy is a native Windows app that opens, edits, and stores .sketch files. In short, it’s long-awaited Sketch for Windows. It solves the big pain of design teams working on different operating systems and improves the process of transition from design to development.
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Principle makes it easy to create animated and interactive user interface designs. Whether you're designing the flow of a multi-screen app, or new interactions and animations, Principle lets you create designs that look and feel amazing.
Origami Studio is a free design tool built by Facebook designers for creating interactive UI prototypes. An elegant, layer-based interface allows designers to repaidly create prototypes with layers, build interactions and then share them with others.