LAUSR

Postpartum depression is a serious mental illnessdisorder that occurs after delivery and is one of the most common post-partum complications. With the increasing popularity and extensive use of smartphones worldwide and the fact that China has become the country with the largest number of smartphone users, it is necessary to have a deep understanding of the use and influence of smartphones and discuss the role of smartphone applications in postpartum depression. This study evaluated and analysed the contents of all postpartum depression applications available in China, applying the US Preventive Services Task Force Recommendation Statement (Interventions to Prevent Perinatal Depression) and expert consensus on the guidelines for the prevention and treatment of postpartum depression. We used the keywords 'postpartum depression; and 'PPD' to search Android, iOS, and WeChat in the Chinese application market. Two reviewers agreed on the coding guidelines and coded the content and functionality of the application through content analysis to determine its intervention and adherence to the guidelines. In addition, we used the Mobile App Rating Scale (MARS) to evaluate the application for engagement, functionality, aesthetics, and information domains and recorded the features of the postpartum depression application. The current findings suggest that despite the recent expansion of smartphone platforms and increased availability of applications, existing Chinese apps for postpartum depression have low levels of adherence to clinical practice-based guidelines. New apps need to be developed, and existing apps need to be revised following evidence-based principles.