RMK-COSIMA is a free Android app developed by CubeFour GmbH in the Lifestyle category, specifically for Health & Fitness. The app is designed to integrate digital Corona self-tests into everyday life. It provides a digital entry ticket to events, gastronomy, and retail for anyone who has taken a Corona self-test under supervision. The app is currently available in Bietigheim-Bissingen, Ehingen, Ettlingen, and Rems-Murr-Kreis (Baden-Württemberg). The Rems-Murr-Kreis is a district in the Stuttgart region that relies on digital solutions during the Corona pandemic, including a comprehensive rapid test portal.

The app offers several features, such as managing test results through the app, making it easier to process self-tests in schools, companies, restaurants, or theaters. The app also allows users to enter self-test results without supervision, which are not valid as entry tickets. Positive cases are automatically reported to the health department. Users need to register to use the app, and they can add other family members to the app. The app only shows the last four test results per person.