The Lion app focuses on the continuous and personalized assessment of changes in the quality of life of cancer patients. Through structured data collection, such as answers to questionnaires, notes in the patient diary and other entries on symptoms or well-being, the app supports those affected in responding specifically to their changes. The long-term recording of data helps to identify regularities, such as recurring symptoms or the positive effects of certain activities. This makes it possible to include quality of life as a central factor in treatment.

The app is available free of charge for Android (Google) and iOS (Apple) and was designed and implemented in cooperation with those affected and is constantly being further developed.