Joyi is an engaging iPhone app designed to enhance mental health by offering personalized mental health skills and fostering sustainable happiness. The app aims to make mental health improvement enjoyable and accessible to all users. By providing a variety of features, Joyi helps users develop a growth mindset, resilience skills, and emotional balance.

One key aspect of Joyi is the concept of filling five main jars - mindfulness, togetherness, meaningfulness, curiosity, and health - with daily little joys to promote sustainable happiness. Users can explore bite-sized mental health posts, personalize their experience, journal their thoughts, track emotions, and monitor their progress in different skills, all contributing to a unique path towards improved mental well-being.