SITUATION Hemophilia is an inherited genetic disorder that impairs an individual’s ability to form blood clots, increasing the risk of bleeding inside joints or the brain. The most common treatment for hemophilia is factor replacement therapy, involving the infusion of clotting factors into the bloodstream. However, complications such as antibody formation can reduce its effectiveness. To develop better therapies, high-quality patient data is required to achieve greater understanding of the relationship between physical activity levels, infusion and the occurrence of bleeding episodes. However, the paper-based activity diaries traditionally used in clinical studies often do not integrate easily into patients’ lives and are vulnerable to missing or inaccurate data entries. A digit

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