"Hoe voelt de chemo" has been developed for patients being treated with chemotherapy. In the app they can keep a diary about how they feel, see when the next therapy is planned and find more information about chemotherapy in general. The diary includes questions such as "Are you hungry today?" and "How ill do you feel on a scale from 0-10?". Some of the data can be plotted in graphs to show a clear historical overview. This information can then be shared and discussed with the physician or nurse.