Rejoyn (also known as CT-152) is a digital therapeutic smartphone application (app) for the treatment of Major Depressive Disorder (MDD) symptoms. Rejoyn is a prescription smartphone app-based digital therapeutic administered to a user via the user’s smartphone device (running Apple iPhone operating system [iOS®] or Android™ operating system [OS]), which delivers a proprietary interactive cognitive emotional and behavioral therapeutic intervention. The core components of Rejoyn are the Emotional Faces Memory Task (EFMT) exercises, brief cognitive behavioral therapy (CBT)-based lessons to learn and apply key therapeutic skills, and short message service (SMS) text messaging to reinforce CBT-based lesson content and to encourage engagement with the app. It is intended for the treatment of MDD symptoms as an adjunct to clinician-managed outpatient care for adult patients with MDD aged 22 years and older. It is intended to reduce MDD symptoms. Rejoyn is designed for use as an adjunct to clinician-managed outpatient care over a period of 6 weeks for the treatment of MDD symptoms, followed by a 4-week extension period where CBT-based lesson content will be accessible but no new therapeutic content or EFMT exercises will be available. Rejoyn is not intended to be used as a stand-alone therapy or as a substitution for the patient’s clinician prescribed medications.