Caffeine Health

Track your caffeine. Protect your sleep. A privacy-first Material 3 Expressive Android app that shows your active caffeine level in real time and tells you if that late espresso will cost you tonight.

Caffeine Health is a beautifully designed Android app that helps you understand how your caffeine intake affects your body throughout the day, and whether that late-afternoon espresso might cost you sleep tonight.

Log drinks from a curated catalog, watch your active caffeine level in real time on a 24-hour curve, and get a personalized sleep forecast based on your unique metabolism.

Live caffeine curve: a smooth 24-hour chart showing your active caffeine level, updated in real time Emoji markers: each logged drink appears on the chart with its emoji for quick visual reference Sleep forecast: see how much caffeine will still be active at your bedtime and whether it crosses your safe threshold Today's total: at-a-glance milligram count for everything consumed today Drink detail sheet: tap any logged drink to see its contribution curve, peak level, current level, and total impact over time Quick actions: edit, duplicate, or delete entries directly from the detail sheet ☕ Drink Catalog Curated drink database: browse drinks across categories like coffee, tea, energy drinks, soda, and more Search & filter: Material 3 search bar with expressive category filter chips One-tap logging: log a drink with a single tap and get snackbar confirmation Custom serving sizes: adjust caffeine amount and timing before logging 🧬 Personalized Onboarding Guided profiling flow: set your age range, weight, bedtime, sleep sensitivity, lifestyle factors, and relevant medications Pharmacokinetic modeling: the app calculates a personalized caffeine half-life based on real-world factors (smoking, alcohol, CYP1A2 inhibitors) Science-backed sources: every lifestyle adjustment links to its pharmacological source Skip-friendly: sensible defaults if you prefer to get started immediately ⚙️ Settings Half-life tuning: fine-tune your caffeine metabolism rate Bedtime configuration: set your typical sleep time for accurate forecasts Sleep threshold: define the milligram level you consider safe before bed Appearance: theme and display preferences Date & time format: 12-hour / 24-hour clock, date format customization

Caffeine Health is built with Material 3 Expressive principles:

Dynamic Color: adapts to your device wallpaper on Android 12+ with a curated espresso-toned fallback palette Expressive Motion: MotionScheme.expressive() for fluid, personality-rich transitions Montserrat typography: clean, modern font family throughout the entire app Haptic feedback: tactile responses on key interactions across dashboard, catalog, and settings Dark mode: full dark theme support with carefully tuned surface/container colors Animated splash screen: the Pulse Cup heartbeat traces itself in on cold start, then dissolves into the app — matching light or dark from the first frame Themed icon: dedicated monochrome launcher layer, so Android 13+ Material You tints the icon to your wallpaper