The last decade has witnessed the digital revolution led by smartphones which has made progress in all aspects of life, not excluding healthcare. This revolution originated with the exponential upsurge of the smartphone, along with its equivalents in tablet technology and some wearables such as smart watches. Over 20 million Nigerians suffer from the mental disease (20% to 30% of the population), with a significant portion of them not receiving professional help. The traditional methods for tracking daily changes in a person's mental state over long periods of time have proven difficult. As solutions for tackling common mental disorders, mobile mental health support applications can be very simple but effective. Although many of the existing applications serve a useful purpose, the majority of them are over-engineered, rather than focusing on the core features that patients require to keep track of their health. This study aims to create a Mobile application that allows patients to track their mental health outside of regular clinical visits by inputting symptom data and receiving personalized feedback. The Mobile application was designed using Flutter as the front end, Node.JS as the server side, and NoSQL as the database. The developed system was found to meet predefined user requirements after it was evaluated by potential users.