The 3D viewer app is not a standalone app, but an integral part of the Design Room.
It is a combination of features that allows you to convert a 2D design into a 3D rendering with a simple drag and drop, and share a preview link with your customers.
You can export a simple 2D image in png or jpg format from your design software of choice like Illustrator, and convert it into a 3D rendering.
You don't need to worry about building the layering correctly like you would do for a design template (for use in the Design Studio, i.e. 3D configurator).
The 2D to 3D is a great tool to quickly create beautiful 3D renderings that you can use for marketing purposes. It also allows you to create photo-realistic images that you can put up on your webshop, and save you time and money.
Once you have created a 3D rendering, you can create a 3D link that you can share with customers. Customers can click on the link, and see the 3D view in their browser and interact with it. This is a great way to create excitement with (prospective) customers.
You can also generate an embed link of the 3D view for your website or blog.