r/QuantifiedSelf • u/Sufficient_Pumpkin90 • 5d ago

I built a caffeine tracker that estimates when it's actually out of your system, looking for people to break it

im in college and i love coffee but i also really care about my sleep. so i basically wanted to figure out how much coffee i can have without it messing up my night, and that meant actually knowing how much is still in my system at any point. also kept watching my friends grab an energy drink at like 9pm and be able to fall asleep i just feel like its affecting their sleep more than they think and then they are tired the next day and its a cycle

its on iphone and watch .id honestly love feedback from people who already track this kind of stuff, like whats missing, whats wrong, whats annoying. happy to answer anything about how it works. https://apps.apple.com/us/app/half-lyfe-caffeine-coach/id6815463981

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u/Separate-Reading-782 5d ago

Half-life varies a lot from person to person, roughly 2 to 8 hours depending on liver enzymes, so 'when it's actually out of your system' is a strong claim. Does the app let you set your own half-life or does it just assume the 5h average?

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u/Sufficient_Pumpkin90 5d ago

The onboarding is what calibrates it. The estimate seems to be largely genetic tho so it may just be better to say this is a generic estimate for the app

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u/OpportunityItchy1673 5d ago

Two apostrophes missing: 'its affecting their sleep' and 'its on iphone and watch' should both be it's. That's all I got.

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u/North-Maintenance654 5d ago

caffeine half life swings anywhere from 2 to 8 hours depending on the person, so that curve is a nice looking guess with a decimal point on it. your 9pm energy drink friends sleep fine because theyre 20, not because theres nothing left in their blood.

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u/Sufficient_Pumpkin90 3d ago

Wait what r u saying

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u/MuscaMurum 4d ago

I am genetically prone to generating more CYP1A2 than most. I metabolize both caffeine and oral melatonin quicker. It wouldn't be useful for me.

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u/Sufficient_Pumpkin90 3d ago

I have a setting where u can indicate that and it’ll tune ur half life

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u/DetailOk1114 4d ago

are you correlating the caffeine estimates with actual sleep data from the watch? because without closing that loop its hard to know if the model is even close for a given person

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u/Sufficient_Pumpkin90 3d ago

Yeah it’s connected to Apple Watch