Simple Depression Test is an iPhone application developed by Yu Zhang in the category of Education & Reference, specifically focusing on Medicine. The app aims to assist users in detecting and screening depressive and anxiety disorders through various features.

The app automatically generates results by calculating scores and differentiating between new and follow-up users. It offers multi-user management, allowing users to store and retrieve records from the built-in database, Firebase, and iCloud. Users can select and delete records using tap and long tap gestures in the bar chart view. Additionally, users can track trends using Bar and Line charts, switch between English, Spanish, and Chinese languages, and toggle between PHQ-9 and GAD-7 assessments.