Neuro-endocrine tumours (NETs) are rare. The PLANET registry has been established in Australia to collect a critical mass of clinical data from NET patients to better understand NETs and their treatment. The PLANET mobile app allows patients to capture their own data and securely submit it to the registry. The patient data includes Quality of Life information, Bristol Stool Scale, physiological data and a simplified scale based on the Eastern Cooperative Oncology Group. The app also allows for doctors and clinicians to send notifications to patients via the app.