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Background  The user requirements for in-hospital cardiopulmonary resuscitation (CPR) support apps are understudied. To study usability, functionality, and design based on user requirements, we applied a mixed methods research design using interviews, observations, and a Kano questionnaire to survey perspectives of both physicians and nurses.    Objective  This study aims to identify what an in-hospital CPR support app should include to meet the requirements and expectations of health care professionals by evaluating the  CprPrototype  app.    Methods  We used a mixed methods research design. The qualitative methods consisted of semistructured interviews and observations from an advanced life support (ALS) course; both provided input to the subsequent questionnaire development. The quantitative method is a questionnaire based on the Kano model classifying user requirements as  must-be ,  one-dimensional  (attributes causing satisfaction when present and dissatisfaction when absent),  attractive ,  indifferent , and  reverse  (attributes causing dissatisfaction when present and satisfaction when absent). The questionnaire was supplemented with comment fields. All respondents were physicians and nurses providing ALS at hospitals in the Central Denmark Region.    Results  A total of 83 physicians and nurses responded to the questionnaire, 15 physicians and nurses were observed during ALS training, and 5 physicians were interviewed. On the basis of the Kano questionnaire, 53% (9/17) of requirements were classified as  indifferent , 29% (5/17) as  attractive , and 18% (3/17) as  one-dimensional . The comments revealed 7 different categories of user requirements with noticeable differences between those of physicians and nurses:  technological challenges ,  keep track of time ,  documentation and history ,  disturbing element ,  improvement areas: functions ,  improvement areas: design , and  better guidance .    Conclusions  The study provides recommendations to developers on the user requirements that need to be addressed when developing CPR support apps. Three features ( one-dimensional  attributes) must be incorporated in an in-hospital CPR support app:  reminder of rhythm check ,  reminder of resuscitation drugs , and  differentiate between adults and children . In addition, 5 features ( attractive  attributes) would result in higher user satisfaction:  all functions on one side ,  access to the patient journal in the app ,  automatic time recording when cardiac arrest is called ,  sound to guide the chest compression rate  (metronome), and  send CPR history to the DANARREST   (Danish in-hospital cardiac arrest registry) database .

Mobile App Support for Cardiopulmonary Resuscitation: Development and Usability Study