Greening and decarbonization of marine operations poise many dilemmas and questions to shipowners and managers. Most commonly, owners should first select a set of technologies to assess and then to evaluate the financial burden of the decision. Based on its experience, the team of HHX.blue developed two web-based tools to support the early stages of decision-making. The aim is not only to promote WASP technologies but to offer sufficient arguments for any selection and allocation of resources, such as capital, time, effort and expertise.