Caffeine Tracker: Half-Life

Ever wonder why you can't fall asleep? Caffeine stays in your body far longer than the buzz lasts. Caffeine Tracker logs every drink in one tap and shows how much caffeine is still in your system — right now and at bedtime.

NOW IN YOUR SYSTEM
• Live estimate of caffeine remaining in your body, based on a half-life decay model
• 12-hour projection curve with your bedtime marked
• Know when your level drops low enough to sleep

ONE-TAP LOGGING
• 16 drink presets: espresso, drip coffee, cold brew, latte, tea, matcha, energy drinks, cola and more
• Custom drinks with any caffeine amount
• Log a drink in under two seconds

STAY UNDER YOUR LIMIT
• Daily intake gauge against your personal limit (default 400 mg)
• 7-day history chart and a full entry list

MADE FOR YOU
• Adjust half-life for fast, typical, or slow caffeine metabolizers
• Set your own bedtime and sleep threshold
• 100% offline — no account, no sign-up, no cloud
• Free, all features included

Caffeine Tracker gives estimates based on a standard elimination model. Individual metabolism varies. This app is not medical advice — consult a healthcare professional about caffeine and sleep concerns.