I really like imoodJournal. It sounds like iphone but is really iphone and android. It's fast, easy, has reminders 3 times per day (that you can shut off), lets you #note details about each entry (I quit doing this because I didn't see a lot of value; I have to hand my phone to my therapist and let him scroll around for him to see the correlations of mood to words which isn't the best feature) and it's easy to graph; you email it to yourself and I don't have a spreadsheet so I just quickly use Google sheets, make the chart, print it and am done in 2 minutes. This one is good if you cycle a lot and need to make several (as many as you want) entries per day. I will admit to giving up a few days in frustration because it is never going to be easy to chart mixed at its' worst but since I HATE rating things it's got to be a fairly good program because I do use it. It did cost I think $2.

There's one called Daily Mood journal I would use if I were only charting 1-2 times daily; your notes show up on the graph. With multiple notations per day it was too messy to read.

I've heard Optomism is good but it won't run on my old iPhone.

I tried about 4 out at once to figure out which was the best for me. The other 2 weren't worth even mentioning.