Hemophilia Mobile App Usability Pilot

"Eligible patients who choose to participate in the study will be asked to wear an actigraphy device \[ActiGraph GT9X Link Actigraph Link\] on their wrist continuously during both 4-week study phases.~The ActiGraph Link is a small (3.5 X 3.5 X 1 cm) wristwatch like device weighing approximately 14 grams that measures indicators of the wearer's activity and sleep patterns, including: acceleration, energy expenditure, steps, basal metabolic rate, activity intensity, sleep time, sleep efficiency, sleep latency, and body position.~The application being utilized is SureSource Engage application from Clinical Ink. The application is compatible to most Android and iOS devices.~Participants will also use a basic Bluetooth-enabled weight scale that syncs with the application."