Apps like that make me think about vanity vs actionable metrics from Lean. What difference does it make if last week you were happy or not? Does it make you change your attitude or take a deeper look on what to do to improve it?
I was just thinking if this were more medically focused it would be good for me. I'm supposed to get a medical journal to track certain things until my next dr visit. If I could just open the app and click on an item to log it that would sure beat having to enter a text somewhere.
Especially useful would be exporting all this as a csv file.