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Comment by codingdave | Hacker News Reader

How would the app know your high energy times? My phone sits idly on a desk while I am actively working, while I am sleeping, while I am out on a walk, while I am painting, swimming, or canoeing around a lake. To my phone, those all look exactly the same. So unless you tell me to actually pick up and use my phone more often, or to tell it what I am doing... both of which I would reject... I'm not seeing how it can figure out my energetic times.

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Those are valid points. Here would be my simple approach (tell me if you think it doesn't make sense or needs some adjustments):

Short, occasional check-ins: The app could nudge you (maybe just once in the morning, afternoon, and evening for a week) to rate how you’re feeling, with a tap or two — think 2 seconds, not 2 minutes.

Learn from your habits: After this “trial week,” the app would look for patterns. For example, if you usually feel sharp at 10am, that gets noted. No need to keep checking in all the time.

I imagine you'd have to log and it finds a pattern. Problem is it can be related to factors the app doesnt have data on.

Another potential idea is biometrics I.e. what sports watches do. Not sure if that stuff is voodoo or real tho.

For a first version, i imagine relying on week's data of user logs and pattern would be a good start. If can potentially iron out other factors that can affect the energy levels.

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