Method of providing an engineering based digital twin platform

A computer-based calculation method wherein a user enters an online platform by an owned second device (1001), subsequently to browse applications which make engineering calculations, the user enters to a market place in an online platform where applications are sold (1002), the method characterized by comprising the following steps:

• querying a requested application on the market place by the user (1007);
• matching the application to a production system which yields a digital twin of the production system by the API consisting built-in functions, solvers, mathematical codes, recursive codes and loops (1013);
• performing requested calculations with a digital twin application by the user (1014);
• taking actions on production lines/machines such as changing operation parameters by the user or by the application;
• and
• exiting out of the market place by the user (1019),
• wherein after the user performs the requested calculations by means of the application (1014), the application asks the user whether obtained operation parameters are applied to the production system manually or not (1015), together with this:
• if manual application is preferred, the user introduces the parameters received from the application to the production system (1016), and
• if automatic application is preferred, the application is connected to the production system (1017) and the application applies parameters itself.