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i think most people don't actually want to track their caffeine like this

your market is the severely autistic

setting aside i have never even heard of a pebble watch until this moment
i'm a heavy coffee drinker and i damn sure don't want to track my caffeine
my wife is a heavy coffee drinker AND autistic/has all those gay apple watch health apps and even she just tracks caffeine by the day

and what if you're wrong
your mathematical model for caffeine doesn't take any confounding factors into play such as people metabolizing and reacting differently to caffeine based on their phenotype and consumption habits

the mathematical models are based on an aggregate average which leaves basically everyone disappointed on the micro scale

i hope this was helpful? i don't mean to be hypercritical but i have a lot of experience trying to sell shit nobody wants

>>34436742
>even she just tracks caffeine by the day
have you shown her this app tho? her input would also be valuable to OP

>>34436701
i think it's cool.

>>34436746
but i don't have a smartwatch and don't consume caffeine*

>>34436701
If you have to manually put in the caffeine what's even the point of it being for the pebble rather than just a stand alone app for a phone. What you need to add is heart rate increase from the caffeine, it would be nice if the watch could also track blood pressure but it cant.

>>34436742
All points are very fair.

Except for the confounding factors part.
The whole point is that you can customize the metabolic rates for both absorption and decay. This is very unusual for such apps.

Later on (once the new model watch ships and the OS APIs are updated to support it) I plan on implementing Heart Rate Variance into the model. This is a parameter that can be used basically exclusively (I wouldn't) to predict the active (blood) caffeine.
And aside from an actual blood test, with a training period of 72h-3weeks can almost perfectly predict the dose. Granted the researchers did use slightly better sensors. But the one on the new smartwatch is very competent too.

>>34437011
The point of using a watch for this is for the convenience. It's much easier to raise your wrist and click 4 buttons than to take out your phone. unlock it, open an app, wait for it load (cuz all phone OSs are crazy bloated) and then click 2-3 times.

+

Actually just normal, low density HR data is pretty much useless for caffeine.
Just the data noise of walking vs sitting is enough to make it useless for this.

HRV is totally different metric and needs high quality sensors for the measurement.

OFC an ECG or BP reading would be even better, but noone except for the severely ill (physically or mentally) use those type of devices as a daily.

>>34437011
>>34436746
>>34436742
* Thanks for the feedback though