Caffeine Tracker - HalfCup

HalfCup helps you understand your caffeine consumption and sleep better. Know exactly when you'll be sleep-ready based on real caffeine science.

TIRED OF BEDTIME ANXIETY?
Stop guessing when you can have your last coffee. HalfCup uses proven half-life decay modeling to show you exactly when caffeine will clear your system. You'll see your "sleep-ready by" time after every drink.

TRACK EVERYTHING WITH CAFFEINE
- Coffee (espresso, latte, cold brew, drip)
- Tea (black, green, matcha, chai)
- Energy drinks (Monster, Red Bull, Celsius, Bang)
- Soda and cola
- Pills (Excedrin, caffeine tablets)
- Chocolate and gum
- Custom drinks you create

LOG IN SECONDS
Quick-add your favorite drinks with one tap. No tedious searching every time. Support for partial servings (half a can, 2.5oz espresso) and decimal precision.

PERSONALIZED TO YOUR METABOLISM
Everyone processes caffeine differently. Adjust your half-life (2-10 hours) to match your sensitivity. The app uses a 30-minute absorption window for accurate modeling.

VISUAL DECAY CURVE
See your caffeine level drop in real-time. Scrub through the timeline to check your levels at any future time. Know if that 3pm coffee will ruin tonight's sleep.

HISTORY AND STATISTICS
- Today, 7-day, and 30-day views
- Daily averages and consumption trends
- Peak times analysis
- Edit or delete past entries anytime

YOUR PRIVACY GUARANTEED
100% offline operation. Zero data collection. No account required. No cloud sync. No analytics or crash reporting. Your health data stays on your device, period. Export as PDF anytime.

SET YOUR DAILY LIMITS
Configure your bedtime, wake time, and daily caffeine goal (default 400mg FDA maximum). Get warnings when you exceed your limit.

ONE-TIME PURCHASE
Pay once, own forever. No subscriptions. No ads. No upsells. Just a simple, honest caffeine tracking app.

SCIENCE-BASED ACCURACY
Built on peer-reviewed caffeine pharmacokinetics. Our database includes accurate caffeine amounts for 250+ drinks. Create custom entries for anything we're missing.

BEAUTIFUL DESIGN
- Light and dark mode support (automatic or manual)
- Clean, intuitive interface
- Smooth animations
- Choose oz or ml units
- Designed for speed

WHO IS THIS FOR?
- Coffee lovers who want better sleep
- Energy drink consumers tracking intake
- Anyone with caffeine sensitivity
- People trying to reduce caffeine
- Students and professionals optimizing productivity
- Health-conscious individuals

FEATURES AT A GLANCE
- Real-time caffeine level calculation
- Sleep-ready time indicator
- Last safe caffeine time for today
- Pre-built database of popular drinks
- Non-beverage sources (pills, chocolate)
- Favorites system
- Partial consumption support
- Adjustable half-life (2-10 hours)
- Daily limit warnings
- Scrubbable decay graph
- Comprehensive history
- PDF export
- Complete offline privacy
- No subscription

SIMPLE. ACCURATE. PRIVATE.
Download HalfCup and take control of your caffeine intake today.

MEDICAL DISCLAIMER
HalfCup provides informational and educational tools only. It is not intended to provide medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider before making decisions about your caffeine consumption, especially if you are pregnant, nursing, have a medical condition, or are taking medications.