Feasibility and Usability Test of a Worker-Centered Mobile Health Application: a Preliminary Pilot Study

INTERVENTION: Behavioral : The intervention in this study is a mobile application‐based behavioral intervention for stress management, not a pharmacological or invasive intervention. Participants in the intervention group will install and use a worker‐centered mobile health application for mental health promotion on their personal smartphones for 4 weeks. They will be encouraged to use the application at least three times per week for approximately 10 minutes per session. The application includes brief self‐management contents designed to support workers’ stress management and mental health promotion, such as stress recording, breathing and relaxation activities, and stretching guides. The use of the application will not be restricted to a specific time of day; participants may use it freely according to their work and daily life patterns. Application log data will be used to monitor weekly usage frequency and duration of each session. Participants who use the application fewer than three times per week will be considered dropouts according to the predefined dropout criteria. Participants in the control group will not use the mobile application during the study period and will maintain their usual daily routines and general stress management practices. At the end of the study period, both groups will complete the usability assessment; however, the control group will evaluate the application based on the provided application information or description rather than actual use. Therefore, the main difference between the two groups is whether participants actually use the mobile application for 4 weeks. The intervention group will receive the app‐based stress management intervention, whereas the control group will not receive the intervention and will serve as a comparison group. CONDITION: Factors influencing health status and contact with health services PRIMARY OUTCOME: Usability score of the mobile application measured using the System Usability Scale (SUS) SECONDARY OUTCOME: Application usage adherence and dropout status INCLUSION CRITERIA: Adults aged 19 years or older Individuals who are currently employed Individuals who use a Samsung Galaxy Android smartphone Individuals with no history of diagnosis or medication use for mental health‐related disorders within the past year Individuals who understand the purpose and procedures of the study and voluntarily provide online informed consent