Zest - Longevity is an application designed to help users achieve longer, healthier lives. Based on a decade of scientific research on the root causes of aging, it provides a tool for users to address aging at its core, even preventing and reversing the biological aging process. Developed by a team of doctors, longevity scientists, and researchers, the application is continuously updated to evaluate and recommend optimal approaches. Zest tracks 8 key longevity pillars: mood, sleep, exercise, sun exposure, cold immersion, fasting, supplements, and blood tests, helping users set daily recommended goals. These goals are combined to form the user's longevity score. Additionally, Zest is compatible with Vital SDK and passive tracking of digital biomarkers, supporting almost all wearables. By leveraging behavioral science and longevity science, Zest utilizes psychology and neuroscience to help users maintain habits that prolong life.