Caffeine Tracker - HalfCup

HalfCup is a privacy-first caffeine tracking app that helps you understand your caffeine consumption and optimize your sleep schedule. Track every cup of coffee, energy drink, tea, and other caffeine sources with scientific precision.

REAL-TIME CAFFEINE MONITORING
See exactly how much caffeine is in your system right now. HalfCup uses an exponential decay model based on your personal half-life setting to calculate remaining caffeine levels throughout the day.

KNOW WHEN YOU'RE SLEEP-READY
Stop guessing. HalfCup tells you the exact time when caffeine levels will drop below your sleep threshold. Plan your last cup wisely and wake up refreshed.

PERSONALIZED TO YOUR METABOLISM
Not everyone processes caffeine the same way. Adjust your half-life setting based on your sensitivity:
- Fast metabolizers (3 hours)
- Normal (5 hours)
- Slow metabolizers (8 hours)

EXTENSIVE DRINK DATABASE
Nearly 100 pre-loaded beverages including:
- Coffee drinks from popular brands
- Espresso-based beverages
- Energy drinks (Red Bull, Monster, Celsius, Bang, and more)
- Teas (black, green, matcha, chai)
- Sodas and soft drinks
- Caffeine pills and supplements
- Chocolate products
- Decaf options

Create unlimited custom drinks for beverages not in our database.

FLEXIBLE SERVING SIZES
Log partial servings with precision. Had half a Red Bull? A double shot? 2.5 ounces of espresso? HalfCup handles decimal quantities accurately.

VISUAL DECAY CURVE
Watch your caffeine levels decline in real-time with an interactive graph. Scrub through the timeline to see projected levels at any point until bedtime.

COMPREHENSIVE HISTORY AND STATISTICS
- Daily, weekly, and monthly consumption views
- Average daily intake tracking
- Peak consumption hours
- Most consumed drinks
- Trend analysis

EXPORT YOUR DATA
Generate PDF reports of your caffeine history. Your data belongs to you.

100% OFFLINE AND PRIVATE
HalfCup works entirely on your device:
- No account required
- No cloud sync
- No analytics or tracking
- No ads, ever
- All data stored locally on your phone

DELETE YOUR DATA ANYTIME
Clear all data with one tap in settings. When you uninstall the app, everything is gone.

SET YOUR GOALS
- Configure your target bedtime and wake time
- Set a daily caffeine limit (default 400mg, the FDA recommendation)
- Receive clear indicators when approaching your limit

BEAUTIFUL DESIGN
Clean, intuitive interface with support for light and dark modes. Follows your system theme automatically.

HalfCup is a one-time purchase with no subscriptions, no in-app purchases, and no hidden costs. Buy once, use forever.

Whether you're trying to improve your sleep, reduce caffeine dependence, or simply understand your consumption patterns, HalfCup gives you the insights you need without compromising your privacy.