Corona-Warn-App is a free lifestyle app developed by the Robert Koch Institute to help break the infection chains of COVID-19. It is a digital complement to distancing, hygiene, and wearing masks. The app uses Bluetooth technology and the Apple Exposure Notification APIs to exchange encrypted random IDs with other devices. The random IDs only provide information about the duration and distance of an encounter, ensuring that no personal information is collected. The app is designed to anonymously inform you if you were recently close to someone who subsequently tested positive for corona. Moreover, the app provides a functionality to add your digital vaccination certificates to prove your vaccination status. The app is your daily companion without knowing your identity, guaranteeing data protection throughout its entire service life.

The Corona-Warn-App is not intended for any use outside of Germany, but it is available in other countries. The app is interconnected with the national health care system of Germany and is provided for anyone living, working, vacationing, or visiting Germany regularly or for an extended period of time. The app's terms of use apply, and by installing and using this app, you accept these terms of use.