ITongue is a tongue image analysis App, which allows the user to take a photo of the tongue with a smartphone or tablet. Then the App will automatically analyze the image to interpret the person’s health status and provide advices on food and lifestyle based on traditional Chinese medicine. In addition, a user can take a questionnaire to obtain further health assessment and recommendation. Although the App is not intended for professional diagnosis, it can provide warning, especially in physical and mental weaknesses, and the users can follow up with hospital visits or lifestyle changes.