PIXEL is the first modular solution combining strong methodology and smart technology for small and medium port ecosystems. It enables optimisation of operations through Internet of Things (IoT) while reducing environmental impact. In addition to a lack of tools for environmental impact assessment, an effective integration of operational data is far from optimal in the majority of ports. Digitalisation does not reach every ecosystem equally, creating considerable gaps between large and small ports. PIXEL addresses all those issues by providing an easy-to-use open source smart platform for operational data interchange in ports and its associated agents (e.g. cities). The project expects to improve several indicators in varying use-cases such as a reduction of 5% in energy consumption, 6% average cost per passenger or 85% in average waiting time for vessels and trucks. PIXEL provides tools and guidelines leveraging technology with a unique approach: creating a single environmental metric for ports and modelling and optimising processes after gathering all available information.