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Lynch syndrome (LS) is an autosomal dominant inherited cancer susceptibility syndrome, resulting from a pathogenic variant affecting DNA mismatch repair genes. Identified carriers require lifelong multisystem care to manage their condition. The aim of this study is to determine whether a patient-facing digital app could be useful for LS carriers in managing their condition. The app includes an evidence-based personal dashboard score showing how up-to-date users are with their LS management. Key findings included that 15% of participants improved their personal dashboard score in 7 weeks of using the app, and 87% would recommend the app to others.