Abstract Mobile health applications (“apps”) have rapidly proliferated, yet their ability to
improve outcomes for patients remains unclear. A validated tool that addresses apps'
potentially important dimensions has not been available to patients and clinicians. The
objective of this study was to develop and preliminarily assess a usable, valid, and open-
source rating tool to objectively measure the risks and benefits of health apps. We
accomplished this by using a Delphi process, where we constructed an app rating tool …