Therapist Aid offers a large library of research-informed, clinician-designed tools to support therapy sessions, including worksheets, handouts, interactive exercises, videos, and articles. Resources are written in plain language and designed to make complex psychological concepts accessible to clients while remaining grounded in evidence-based practice. The platform serves therapists, educators, and students, with options for free access or paid memberships ($6.25 per month) that unlock premium, customizable, and fillable materials. Tools cover a wide range of topics, client populations, and therapeutic approaches, and are available for printing or digital use. Therapist Aid is widely used for session activities, homework assignments, and psychoeducation.