The growing need for decarbonization and the high costs of offshore platform decommissioning make it essential to adopt a strategic approach for repurposing these structures. Our application offers an innovative solution to support decision-makers in the oil and gas industry. Through an interactive, multi-criteria-based tool, our system enables stakeholders to assess sustainable repurposing alternatives. Users can define evaluation criteria, assign weights to each, and obtain a ranking of the best options, such as wind turbines, solar panels, or macroalgae cultivation. The platform not only simplifies decision-making but also ensures that economic, environmental, and regulatory factors are considered. In this way, we help transform decommissioning challenges into opportunities for the energy transition.