Kof - Caffeine/Coffee Tracker

Kof tracks your coffee and shows your caffeine level decaying in real time — so you always know exactly when to have your last cup. No accounts. No subscriptions. No tracking. Just your coffee, your data, and a clear picture of what's in your system. ONE-TAP LOGGING Log a coffee with a single tap. Long-press to pick from espresso, doppio, filter, or your own custom drink types. REAL-TIME CAFFEINE CURVES See your caffeine level right now using a two-phase model: 30-minute absorption followed by exponential half-life decay. Visualise your levels across 2-hour, 24-hour, and 7-day windows. SLEEP CUTOFF WARNINGS Kof calculates exactly when to have your last coffee so you drop below your personal sleep threshold by bedtime — factoring in your current level, drink size, and metabolism. STATS & HEATMAPS Weekly bar charts, 30-day averages, monthly heatmaps, volume tracking, and an all-time total. Share your stats as a card. kof PRO — ONE-TIME PURCHASE Unlock custom drink types, adjustable caffeine half-life, personal daily limit, bedtime settings, CSV history export, and shareable stats cards. Pay once — no subscription. 100% PRIVATE BY DESIGN All data stays on your device. No accounts, no cloud, no analytics, no tracking of any kind. Free to download. Start tracking in seconds. Synchronises with your Apple Health data. Data is fully exportable using CSV files.