I'm currently using Daylio. It works fine, but, given the sensitive nature of the information, I want something more private/trustworthy. The following is what I am looking for in the app:

Essentials:

Android app.
Support custom tags and notes when recording a mood.
The ability to add a mood for a specific day/time other than current (for example, if I miss an entry).
Support multiple entries per day.

Nice-to-haves:

Visualizations of the moods, and other data, over time
Data exports/backups

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[–] Wistful@discuss.tchncs.de 4 points 1 month ago (2 children)

Honestly, you can just use the habit tracking app.

Loop Habits Tracker is a good one.
You just create a measurable habit and use 1-10 scale for your mood tracking.

It does have the option for notes but no tags unfortunately.
You can add entries retrospectively.
It has nice data visualization and you can export data.
Since it's a habit tracker it's pretty private. You can name your mood tracker (habit) however you want, nobody can even tell it's a mood tracker.

[–] Klaymore@sh.itjust.works 4 points 1 month ago

I'm not sure how well it works as a mood tracker, but I love this app, I've been using it for years.

[–] Kalcifer@sh.itjust.works 2 points 1 month ago

This doesn't quite meet my requirements for a mood tracking app, but thank you for the recommendation of it as a habit tracker! I will definitely make use of it for tracking habits.