From an anonymous user:

I have manic-depression/bipolar illness, and keeping a mood diary is very important for my treatment. If I can “check in” a few times a day, I have data for my psychiatrist and myself that can save me from a manic or depressive episode “sneaking up on me.” But carrying a paper notebook around is usually too much trouble and so I end up not recording information that would help my treatment. But I always have my phone with me, so it is effortless to capture this data, especially since I set up the reminder app on my phoe to beep at me and remind me to check in.

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