COVapp gives you the opportunity to participate in the scientific research into COVID-19 or in research for effects of the Corona pandemic on health and well-being. When you have created an account (emailaddres and phonenumber for 2-step verification login), you can login and use the app. The app doesn't collect any personal information. You can fill in questionnaires and see more INFO and FAQ about the study. When you start, you have to give your consent, else you can't start using the app.
The app does not collect any other data from your device, other then the you manually enter.