We develop web-based applications and Windows programs for designing substructures of photovoltaic systems. In addition to the static-constructive evidence based on various standards that are valid worldwide, a price calculation can also be carried out including all system components of the solar substructure. In this way, planning can be carried out from a geometric and static point of view, and the economic efficiency of the application can be assessed. Our measurements are not just limited to flat roofs, but also include other roof shapes such as saddle roofs, pent roofs or hipped roofs. Wind and snow loads can also be determined. This ensures the optimized distribution of the necessary ballast according to wind tunnel reports and the optimized distribution of the necessary fasteners (to provide static proof).