<p>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.</p><p>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.</p><p><b>Features:</b></p><ul><li>Real-time 24-hour caffeine curve with emoji drink markers</li><li>Personalized pharmacokinetic modeling based on age, weight, lifestyle</li><li>Sleep forecast — see if caffeine will affect your bedtime</li><li>Curated drink catalog: coffee, tea, energy drinks, soda</li><li>Drink detail sheets showing individual contribution curves</li><li>Quick actions — edit, duplicate, or delete entries</li><li>Material 3 Expressive design with dynamic color</li><li>Montserrat typography and haptic feedback throughout</li><li>Full dark mode support</li></ul><p><b>Privacy:</b></p><ul><li>Fully offline — all data stays on your device</li><li>No ads, no tracking, no analytics, no accounts</li><li>Open source (GPL-3.0)</li></ul><p><b>Science:</b></p><p>The app uses a one-compartment oral pharmacokinetic model with personalized half-life calculation. Your caffeine metabolism is estimated from age, weight, smoking status, alcohol intake, and CYP1A2-inhibiting medications — grounded in real pharmacology.</p>