The purpose of this study is to determine the parameters of the best possible spatial user interface design for the online shopping experience in mixed reality. In the first phase of the study, ten existing augmented and virtual reality shopping applications are examined, and the spatial relationships of the interfaces used in these experiences and the possibilities of natural interactions provided to the user are compared. In the next phase of the study, the interfaces are evaluated to propose a three-dimensional spatial interface powered by the mixed reality that improves the spatial relationship and neutrality of these interfaces.