New windows are mainly sold in showrooms. Samples are shown and catalogues are looked through, but it is difficult for customers to imagine how the windows will look in their own four walls. With the fenzta HOME app, things are different: frame materials, decors, colours and layouts can be presented and tested in the customer's home. Creative design and planning can be carried out on the tablet or smartphone and every change is immediately visible in 3D. And when the new window is projected into the wall opening using augmented reality (AR), the customer can experience whether it fits in well with the interior design and the exterior façade. Selling becomes very easy. The customer enjoys it.