Background: Falls and fall-related injuries are a major challenge for healthcare systems worldwide as a substantial proportion of falls occur for older adults who are neither frail nor at high risk. Hence, preventive measures are needed, sensitizing older adults for their possible fall risk. Health applications seem to be a promising attempt to address this problem, as they enable users to assess their individual fall risk on their own. Objective: Identify product features of a fall prevention smartphone application which increase or decrease users' satisfaction and therefore their motivation to use such an application. Additionally willingness-to-pay was assessed to get to know how such an application could be monetarized. Methods: A total of 96 participants completed an open self-selected Web-based survey. Participants answered various questions regarding health status, subjective and objective fall risk, and technical readiness. Seventeen predefined product features of a fall prevention smartphone application were rated according the Kano model by participants. This model is known from user oriented product development and captures expectations towards and satisfaction by a product. Results: Five product features were identified to increase users' acceptance including a checklist of typical tripping hazards, an emergency guideline in case of a fall incidence, description of exercises and integrated workout plans which decrease risk of falling. Participants' willingness-to-pay was assessed after all 17 product features were rated and revealed a monthly payment rate of €7.56 Euros (SD = 12.6).
Conclusions:The results show various motivating product features that should be incorporated into a fall prevention smartphone application. Our results show aspects that fall prevention and intervention designers should keep in mind to encourage individuals to start joining their program and facilitate long-term user engagement, resulting in a greater interest in fall risk prevention. Trial Registration: Not applicable.