Needs the Mood Tracker feature. Open More > Mood.
Recording your mood
Pick how you feel on the scale, add emotions if you like, and write a note. Save.
You can choose the scale (five faces or 1 to 10) and whether Marvin asks about emotions in the settings (the cog at the top right).
Screenshot to add: The Mood Tracker
Your history
Tap the chart icon at the top right to see:
how this week compares to last week
a trend line with a 7-day average
a calendar of your moods
which emotions show up together with better or worse days
Screenshot to add: Mood History