Threed.io is described as '- a demo to show what could be possible in the stock photography market' and is an website in the Photos & Graphics category. There are six alternatives to Threed.io, not only websites but also apps for a variety of platforms, including iPhone, iPad, Android, Android Tablet and Mac. The best alternative is Principle. It's not free, so if you're looking for a free alternative, you could try Origami Studio or Adobe Comp CC. Other great sites and apps similar to Threed.io are Mockup.io (Free), Fluid UI (Freemium) and Moqhub (Freemium).
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.
Comp CC makes it easy for designers to lay out ideas with real assets like photos, text and shapes. They can then send the wireframe to Photoshop CC, Illustrator CC, InDesign CC or Muse CC to refine and finish.
Upload your designs,mockups or wireframes and organize them in projects. Share them with friends, colleagues and clients to get point specific Feedback. Giving Design Feedback is easy possible without any registration by your customers. You can Upload Images and Multipage PDFs