Caffeine Tracker & Sleep Time
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About this app
☕ 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! ☕
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! ☕
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
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No data collected
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