Depression Test is an iPhone application developed by Inquiry Health LLC. This free app is designed to help users evaluate the severity of their depression through a scientifically formulated questionnaire. The app utilizes the Patient Health Questionnaire (PHQ-9), a widely recognized self-test questionnaire.

Clinical depression is a mood disorder that can significantly impact one's daily life, causing feelings of sadness, loss, anger, or frustration that persist for weeks or longer. Depression Test aims to assist individuals in assessing their mental health by providing a convenient and accessible tool.

It is important to note that this self-test is not intended to serve as a diagnosis for depression. Users are strongly advised to consult a physician if they have concerns about their mood. Depression Test should not be used as a substitute for professional treatment or guidance.