TrustOne App is a free iPhone application developed by TE-FOOD International GmbH. This app provides QR-based traceability, mainly for traveling, hospitality, and working environments. With TrustOne, users can easily trace and track their contacts, movements, and exposure to potential COVID-19 cases.

The app offers a simple and intuitive interface that allows users to scan QR codes at different locations, such as hotels, restaurants, and offices. These codes contain information about the place and time of the visit, which is then stored in the app. In case someone tests positive for COVID-19, users can easily check if they have been in contact with that person through the app. TrustOne also offers useful information and guidelines to help users stay safe and prevent the spread of the virus.