Caffeine Health

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.

Features:

Real-time 24-hour caffeine curve with emoji drink markers Personalized pharmacokinetic modeling based on age, weight, lifestyle Sleep forecast — see if caffeine will affect your bedtime Curated drink catalog: coffee, tea, energy drinks, soda Drink detail sheets showing individual contribution curves Quick actions — edit, duplicate, or delete entries Material 3 Expressive design with dynamic color Montserrat typography and haptic feedback throughout Full dark mode support Privacy:

Fully offline — all data stays on your device No ads, no tracking, no analytics, no accounts Open source (GPL-3.0) Science:

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.