How do you know when someone is high energy?

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.

Yup, I've wanted to make something like this. There's focus vs creativity periods. The brain focuses better when tired, but people's cycles are very different. So it's best to just prompt them how they feel periodically and whether the task was a good fit. This is similar to how they did the research that uncovered the concept of being in flow.

I think an app that schedules tasks around when you’re most energized could really boost productivity. But I get the concerns about tracking data. It might make sense to lean into some more passive methods for gathering info. Like, maybe use the sensors on our phones to keep tabs on activity, sleep, and location to figure out when we’re hitting our peaks. Also, it could be cool to add some gamification—like giving users points for checking in on their energy levels or for knocking out tasks when they’re firing on all cylinders. That could help keep people engaged with the app and make it more useful.

There is something like this in Supermemo (flashcard program, like Anki). But it need a lot of data like your sleep time, historical result of your study (at what hours you answer more correctly), etc. [1][2]

But to me this ideas feels like procrastination by building anti procrastination apps. To most people, Pomodoro timer is enough.

If you really want to make that app, just be aware that the rabbit holes can be quite deep. Good luck OP!

[1] Planning a perfect productive day without stress https://supermemo.guru/wiki/Planning_a_perfect_productive_da...

[2] Natural creativity cycle https://supermemo.guru/wiki/Natural_creativity_cycle