I downloaded three different mood tracking apps, and this was the winner by far. The ability to edit entries was very important to me, particularly the time and date, since this allows you to enter things after the fact. I also initially looked for the ability to define any extra parameter and have it (roughly) graphable, which this does, though, I have since stopped using that feature. Also really like the way you can create your own hashtags, and look at entries grouped by hashtag. I never use the photo feature, however.
Digitalison about iMoodJournal - Mood Diary