At a first look, mood tracker apps are fucking disgusting. Anyone got one they like? Or should I just start a spreadsheet?

Signing up for X dollars a month to have access to an interface that will simply allow me to make notes about how i might feel at a certain time. Best of all, companies will probably use my own reflections on my mental health to...sell me more shit.

Anyone got a mood tracking app they like, or should I just set up a spreadsheet month by month and invite my therapist to collaborate on it?