Electronic patient files prevent dangerous drug interactions; telemedicine provides patients access to medical expertise no matter where they are; health apps strengthen the chronically ill. In the digital transformation of the healthcare sector, however, EU Member States are advancing at different speeds. In our #SmartHealthSystems study, which is now published in English, we compared the progress of Digital Health in 14 EU Member States and three OECD countries. Using our specifically developed Digital Health Index, we found three key factors common to the leading countries. In addition, the study provides insights into the ‘lessons learned’ of various countries regarding the implementation of Digital Health into regular healthcare delivery.