As wonderful as Christmas is, it can be a depressing time of year for some people. iPhone Life contributor Harvey Castro, M.D., has created Sad Scale, an app that helps people assess their mood and determine if they're depressed. It has five different assessments, including scales for postpartum, geriatric, and child depression. You simply answer a questionnaire, and the app helps you get a sense for where you stand. It was recently featured on KDAF-TV in Texas. A specialist interviewed said that the app helps heighten self-awareness and helps people look at their own moods. Of course, the app isn't meant to be a substitute for medical care, but instead is intended to be used in conjunction with a health care provider. It aids people in tracking their moods and communicating the results with their physician.