Inclusion Criteria:  Informed consent as documented by signature. Over 50 years of age on date of randomization. Patient received prescription medicine against hypertension by post from MediService. Prescribed a therapy against hypertension consisting of 4 or more tablets taken per day. At least 1 dose of medication per day must be against hypertension. Participant administers their own medications. Participant owns a smartphone with a data plan or constant internet access during the study reporting events and at home to use the application. Minimal required smartphone operating system is iOS 12 and Android 8 (Oreo). Adequate communication in German or Swiss-German (all study documentation will only be set to the German language).  Exclusion Criteria:  Inability to operate a mobile phone and the Collabree application. Inability to follow the procedures of the study, e.g., due to language problems, psychological disorders, dementia, etc. Enrollment of the Sponsor-Investigator, their family members, employees, and other dependent persons. Participation in another interventional clinical trial.