Sad Scale is an Apple™ app that uses brief questionnaires to let users get involved in their mental health. It contains four widely-used screening measures for depression: one for adults, one for children, one for elderly adults, and one for postpartum depression. Users can complete these measures multiple times and keep track of their scores on a graph that can also be shared with a doctor. Sad Scale is designed to help users who are concerned about their mental health to make more informed decisions and better manage their lives. However, this app does not appear to have been revised for some time, and users should be cautious when using apps without security updates.