I’ve had a look now. My thoughts are that you are trying to predict ‘every Thursday evening the kids are more difficult to put to bed because they are tired from swimming on Wednesday and getting up early for breakfast club on Thursday morning’. Is that the gist of it?
I would already know this, so wouldn’t pay a monthly subscription for it. There are already apps for family sharing calendars and budgeting.
It terms of emotions, I’m not sure you can predict this in advance, especially for women, as it changes week by week and daily. So if I’ve got a lot to do just before my period, I might feel overwhelmed and cranky about it all, but the next week I’ll be fine again. Now, I don’t think I would want to explain this to an app that my DC would have access to, or at all really, as it would just be another thing to do.
Also, I can see you’ve made the DC area private - but what if they put concerning in there? Will it trigger something to the adults if they are e.g very unhappy, otherwise what’s the point? Could you be liable in some way if this wasn’t alerted to someone and the child harms themselves? I think there may be potential safeguarding risks which you should think about.
In short, my opinion is that it may be useful to men who need everything spelling out to them. But I’m guessing that type of person wouldn’t want to use an app like this in the first place.