A 3D configurator allows users to customize and configure products according to their personal preferences by selecting and visualizing different options such as colors, materials, sizes and features.
In contrast, a 3D viewer allows users to view and rotate the product from different perspectives to get a comprehensive idea of it. However, a 3D viewer usually does not offer a function for customizing or configuring the product.
In the world of Augmented Reality (AR), for example, customers can "project" a 3D model of a sofa into their personal living room and see how it would look there without physically holding the actual piece of furniture in their hands.