TY - JOUR A1 - Munzert, Simon A1 - Selb, Peter A1 - Gohdes, Anita R. A1 - Stoetzer, Lukas F. A1 - Lowe, Will T1 - Tracking and Promoting Usage of a COVID-19 Contact Tracing App. JF - Nature Human Behavior N2 - Digital contact tracing apps have been introduced globally as an instrument to contain the COVID-19 pandemic. Yet, privacy by design impedes both the evaluation of these tools and the deployment of evidence-based interventions to stimulate uptake. We combine an online panel survey with mobile tracking data to measure the actual usage of Germany’s official contact tracing app and reveal higher uptake rates among respondents with an increased risk of severe illness, but lower rates among those with a heightened risk of exposure to COVID-19. Using a randomized intervention, we show that informative and motivational video messages have very limited effect on uptake. However, findings from a second intervention suggest that even small monetary incentives can strongly increase uptake and help make digital contact tracing a more effective tool. Y1 - 2021 UR - https://opus4.kobv.de/opus4-hsog/frontdoor/index/index/docId/3819 UR - https://nbn-resolving.org/2397-3374 IS - 5 SP - 247 EP - 255 ER -