The purpose of this study was to develop a smartphone-based injury-prevention application (S-IPA) for teachers working in child-care centers, and to test the satisfaction level of the users of the application (app). Through a literature review and needs assessment, an app compatible with the Apple iPhone operating system was developed. The app was verified and the mean total satisfaction with 7 features of the app was 7.76 (± 1.13) on a score of 1-10. The result of the S-IPA survey showed a positive response, indicating a high potential for use as a teacher's educational guide, which would provide an effective information delivery system for the prevention of possible injuries at child-care centers.