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: tk32189@naver.com

★ Small habits, real difference. Log your first cup today! ☕