Tess is a psychological AI that administers highly personalized psychotherapy, psycho-education, and health-related reminders, on-demand, when and where the mental health professional isn’t. Interaction with Tess is solely through conversation, exclusively via existing communication channels, such as SMS, Facebook Messenger, Web Browsers, and several other platforms. Tess is where the patient already is, and just a text message away. She is just a cell number; no app required, no smartphone required, zero friction.