A light caffeine diary that calculates today's residual caffeine and tells you a "good time to sleep".
Log a drink in a second and the app uses a caffeine half-life model to estimate residual caffeine and a recommended sleep time. No sign-up, everything stored only on your phone.
Espresso, Americano, Latte, Cold Brew, Energy Drink — 17 presets, plus custom entries.
A half-life model (~5h) keeps residual caffeine in real time and suggests when to head to bed.
Caffeine over time, visualised so you can see at a glance what your day looks like.
Scroll through daily and ranged entries easily. Delete mistaken logs in a tap.
Total cups, total caffeine, daily average, top 10 drinks, last 14 days graph and category breakdown.
Korean / English language toggle and an in-app dark mode independent of the OS.
Right after the morning coffee, after lunch, before a late shift — log a cup each time. By the weekend, the Stats tab will show your own caffeine pattern, and the Sleep graph will reveal how much longer an afternoon latte keeps you awake.
Caffeine logs are stored only in your phone's SQLite database. No external uploads, no sign-up. Uninstalling the app or using "Delete all data" permanently removes every entry.
The caffeine half-life and thresholds shown are general estimates — your body, medications, pregnancy and caffeine sensitivity may differ. Do not use this as a basis for medical decisions. Not intended for children under 14.
No sign-up, completely free with ads. Install and start right away ☕
📲 Get it on Google Play