A month ago, I built Coffee Police because I wanted to get the most out of my caffeine, not just avoid the crash but actually understand what it's doing in my body.
This week, JAMA published a 43-year study on 130,000 people that made me feel very vindicated. They found that 2-3 cups of caffeinated coffee a day cuts dementia risk by 18%, even for people with high genetic risk.
Here's the catch, though: caffeine has a half-life of 5-7 hours. So, that afternoon cup can still be very much active at bedtime, disrupting the sleep your brain needs to get those benefits in the first place. Drinking coffee for brain health while letting it wreck your sleep kind of defeats the point.
That's the gap Coffee Police is built to fill. It tracks your active caffeine levels in real time and tells you when to stop for the night, based on your bedtime and how sensitive you are to caffeine. Free, no subscription, no ads.
When do you usually have your last cup?
https://coffeepolice.net/

Last year, I was on a roll drinking coffee multiple times a day to keep myself energized. I loved the feel of it. Then I realized my sleep was getting disruptive. As a product builder, I started A/B testing my habits to figure out what was wrong - turned out I needed to track my caffeine so I'd know when to stop and how it would impact my sleep.

But here's the problem: I couldn't find an app that didn't ask for money, didn't bombard me with ads, AND actually helped me understand the connection between caffeine and sleep.