With vui, you can focus simply on mood tracking:
∙ Record your mood for the day or any previous days that you missed
∙ Select reasons behind your mood and add a personal note to your entry
∙ View your mood entries in calendar or list form
∙ Customize your list of reasons
∙ Get an overview of your mood statistics and the reasons behind them

Additional features:
∙ In-app authentication with TouchID, FaceID, or vui's passcode
∙ Reminder notification
∙ Data backup/restore