I use pixels. It’s as simple as clicking on a color coded face, and then that color is used to shade the day on the calendar so you can see bigger trends. There’s a note section if you really want to add detail/notes or tags, but it’s not required.

I use Daylio because I started there years ago and I don’t want to lose all the data.

I have used and liked eMoods. I even donated because I liked that it is designed for bipolar disorder. In regular mood tracking apps, “happy” is the highest and there’s no manic range, so one has to improvise a scale. eMoods doesn’t have this problem.

Another one made for BD is Bipolar UK Mood Tracker. I have always found their bipolar mood scale useful, so I remember enjoying the app.

And lastly, UP! also contemplates mania. I didn’t like it as much as the others because I felt it had too many elements (this was years ago, though); but one useful thing is that if you track too many high or low moods, it sends you a notification with a warning. That’s nice.