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Shortly after birth, every child in Germany receives a Certificate of Vaccination. By adulthood the yellow WHO booklet should be filled with up to 13 vaccinations, but about 50% of the population lack important vaccinations. Most people are willing to be vaccinated, but keeping track of vaccinations is too complicated. People are also often not aware that or when they should be vaccinated. The app helps people to understand their vaccination status and uses a personalised nudging strategy to create vaccination reminders.