Caffeine Tracker & Sleep

☕ How many coffees did you have today? Caffeine Tracker is a lightweight caffeine diary that logs every drink, estimates how much caffeine is still in your body, and tells you the time you can safely fall asleep. No account, no upload — your data lives only on your phone. Free, ad-supported. ✅ Made for you if you… • drink 2–3 coffees a day and sometimes can't sleep at night • want to cut down on caffeine • track health/diet and want caffeine on the same page • study, work nights, or watch your caffeine timing for exams 🔑 Key features 📝 Fast logging • 17 built-in presets: espresso, americano, latte, cold brew, energy drinks, tea, chocolate, … • Custom entry — name and milligrams in one tap • Today's drink count and total caffeine update instantly 😴 Sleep guide • Real-time remaining caffeine using a 5-hour half-life model • "Recommended bedtime" = when remaining drops below 50 mg • Hour-by-hour caffeine curve, easy to read at a glance • Clear answer: "you can sleep now" or "in X hours" 📅 History • Day-by-day intake log • Lightweight scroll, no clutter • Delete a wrong entry in one tap 📊 Stats • Days tracked, total drinks, total caffeine • Average caffeine per day • Top 10 drinks • Daily chart for the last 14 days • Share by category — coffee / tea / soda / energy / other 🌐 Multilingual • English / 한국어 • Switch any time in settings 🎨 Light & Dark theme • App-level dark mode, independent of OS theme • Comfortable for late-night logging 🔒 Privacy — 100% local • Caffeine logs are stored only in a local SQLite database on your phone • No server upload, no account • Uninstall or tap "Delete all data" to wipe everything 💡 Tips • Log in the morning, after lunch, before late work — one second each. After a week, your caffeine pattern appears naturally in the Stats tab. • The Sleep curve makes it obvious how long that "3 pm latte" actually lasts. ⚠️ Notice • The half-life and threshold used here are general estimates. Your real metabolism varies with body, medication, pregnancy and caffeine sensitivity. Do not use this app as medical advice. • Not directed to children under 14. 📮 Contact / Feedback • Use Settings → Contact to email us • Email: [email protected] ★ Small habits, real difference. Log your first cup today! ☕