Read about CBT and save yourself $5.

Pales in comparison to other available apps. If I could ask for my money back, I would. No analytics to speak of, no real insights, just a series of tasks "designed" to help you improve your mood over time as you create helpful habits for yourself. Yes, this is probably based on sound CBT practices, but basically a checklist is not worth $5. Avoid this and look at mood analysis and correlation apps. Most of them are cheaper, or even free.

eyv about MoodKit