In our daily lives and also in the medical field, patients and healthcare professionals are increasingly using apps. On June 16, the European Commission (EC) published “MDCG 2025-4 Guidance on the safe making available of medical device software (MDSW) apps on online platforms.” While the EC has published several pieces of guidance on MDSW already (our next update will be on the MDCG 2019-11 rev..