Caffeine Clock is a science-based caffeine tracking app that shows your current and future caffeine levels, helping you time your coffee consumption to avoid sleep disruption. Built by a self-proclaimed caffeine enthusiast who couldn't find an adequate tracker, this app utilizes pharmacokinetic models to accurately predict the amount of caffeine remaining in your system throughout the day and when it's safe to sleep. Unlike generic health apps that simply log beverages, Caffeine Clock takes into account absorption rates, half-life calculations, and individual sensitivity to deliver personalized insights that actually protect your sleep quality.

The app features an intuitive dashboard with a live caffeine curve that visualizes your levels rising and falling in real-time. Long-press the timeline to scrub forward and see exactly how much caffeine you'll have at your bedtime, allowing you to make informed decisions about that afternoon espresso before it's too late. The comprehensive onboarding process asks research-backed questions about your sensitivity, metabolism, and sleep patterns to calculate your personalized caffeine half-life and sleep-safe threshold, ensuring recommendations match your unique physiology rather than generic guidelines.

With over 200 drinks pre-loaded in the database—from Starbucks lattes to popular energy drinks and specialty teas—logging your intake takes seconds. You can also create custom drinks with specific caffeine amounts and serving sizes for your favorite local café or homemade brews. The app works completely offline, with no account required, storing all data locally on your device and offering the option to transfer it between phones. Users appreciate the streak tracking feature, which gamifies maintaining healthy caffeine habits by showing consecutive days where bedtime caffeine levels stayed within safe ranges.

Key Features

• Accurate Pharmacokinetic Algorithm: Models caffeine absorption rate and half-life decay with support for "sipping duration" to provide realistic estimates rather than simple arithmetic tracking
• Predictive Caffeine Timeline: Visual graph displays current levels and projects future caffeine amounts, showing exactly when you'll reach your sleep-safe threshold
• Personalized Onboarding Quiz: Research-backed questions establish your unique caffeine metabolism, sensitivity level, and ideal bedtime threshold for tailored recommendations
• 200+ Drink Database: Pre-loaded library of coffees, teas, energy drinks, and sodas from major brands, plus ability to create unlimited custom beverages
• Privacy-First Offline Design: Zero account creation, no cloud sync, fully functional without internet—all tracking data stays exclusively on your device

Who This Is For

• Coffee lovers and caffeine enthusiasts who want to enjoy multiple cups daily without sacrificing sleep quality or experiencing insomnia
• Shift workers and professionals with irregular schedules who need to strategically time caffeine intake around changing sleep patterns
• Health-conscious individuals tracking wellness metrics who want scientific accuracy in understanding how long caffeine affects their system

Common Questions

How does this caffeine tracker calculate absorption?

Caffeine Clock utilizes scientifically backed pharmacokinetic models, based on caffeine's approximately 5-hour half-life, which factor in absorption rate and optional sipping duration for accuracy that exceeds that of simple calculators.

Do I need to create an account to track my caffeine?

No, Caffeine Clock requires no signup or login. The app operates completely offline, storing all data locally on your phone with optional local transfer capability between devices.

Can I add drinks that aren't in the database?

Yes, you can create unlimited custom drinks by entering the caffeine amount in milligrams and serving size, perfect for local cafés, homemade coffee, or specialty beverages.

Is my caffeine consumption data private?

Absolutely. All tracking data is stored locally on your device with no cloud functionality. You can optionally share anonymous analytics to help improve the app, but personal caffeine logs remain private.