The app is part of a study on the mental health of secondary school children. The research study has been approved by Imperial College London research ethics committee (ICREC number - 20IC6132). The app will be used only by students from participating schools. In the current version, the app asks to complete a mental health questionnaire on a daily basis and sends the data entered by the users to our secure server for analysis. This app integrates with the health app (HealthKit) to get the step count data in order to do further data analysis to build the mental health profile. The app also collects the following data (location, background noise levels, screen brightness levels and battery levels) from the phone. The user has the option to turn on/off the data collected by the app. The app was developed by the Brain & Behaviour Lab (https://faisallab.org/) at Imperial College London (Prof. Aldo Faisal).