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.