Caffeine Clock

Hi guys! I would love to show you Caffeine Clock 2.0, a caffeine tracker app that helps you know exactly how much caffeine is in your body and how much will be there when you go to sleep. So, let's start with a bit of context. I’m a very heavy caffeine user—think multiple coffees a day, an energy drink, and a bunch of Coke Zero on top of it—so I’ve always sought to improve my awareness of how much caffeine is actually in my body. Particularly, I wanted to know if I could still have that coffee and still sleep at night. About one and a half years ago, I was travelling in Japan solo, and I didn’t have that much to do and drank a lot of Starbucks coffee—so over the evenings and on rainy weekends, I created Caffeine Clock 1.0 (a version you can still see on the Apple App Store, until they approve the new one, hopefully soon). It was also an opportunity to learn React Native, a technology I always wanted to try out as a web developer myself. The app was very basic, but it worked—and with almost no promotion (a couple of Reddit posts), it gained a small audience of people who really liked it. Now, I didn’t want to promote it too much or monetize it, since I didn’t think it was very good. It had glaring issues, such as lack of personalization, the dashboard visualization was extremely basic, and the caffeine calculation itself didn’t account for absorption time or the time it takes to drink it. A few months ago, I finally decided to jump back into it and make it the app I always wanted it to be. INTRODUCING CAFFEINE CLOCK 2.0 Basically, I am trying to make it the best caffeine tracker there is. - Accurate caffeine algorithm—able to take the absorption rate and a “sipping” duration into account to actually give you a realistic estimate - Comprehensive onboarding, which (at least I hope) asks relevant questions supported by studies—those will set your caffeine half-life and sleep-safe threshold - Over 200 drinks in the database—or create your own as well - Fully offline—the data is only on your phone. No login, nothing. You can move the data from phone to phone - Analytics—including average caffeine consumption, a streak of days where your caffeine amount was good at your bedtime, drinks breakdown, etc. - Localized into five languages (some of them AI-translated; please help me if you find something weird) - Free. It is supported by ads, and there is an option to support the app directly and remove them forever. This is hopefully just a start! If the app is popular, I’d love to create widgets and watch integrations, and a bunch of other features. Please tell me what you think!