Vessel: Water Tracker

Vessel is the smartest way to track your daily hydration. Unlike other apps that count every drink equally, Vessel uses real peer-reviewed research to show you how hydrating your drinks actually are. WHY VESSEL IS DIFFERENT • Scientific hydration multipliers — coffee counts as 92% hydrating (Killer et al. 2014), beer at -10%, spirits at -50% • Beautiful ocean-depth progress ring that deepens as you drink more • Built-in health warnings for excess caffeine, alcohol, and overhydration FEATURES • Fast logging — one tap to add water, coffee, tea, beer, wine, and more • Daily progress ring with smooth water wave animation • Celebration when you hit your goal • 12 achievement badges for streaks and milestones • Week / Month / 3-Month charts with color-coded drink breakdown • Hydration Science page with cited research • Smart reminders at your chosen hours • Apple Health sync for water and caffeine • Body weight-based goal calculator • Dark mode support • Ounces, milliliters, and liters HEALTH WARNINGS Vessel alerts you when: • Caffeine exceeds FDA's 400mg/day limit • Alcohol intake crosses CDC moderate drinking guidelines • Water intake approaches levels that risk hyponatremia (over 3.5L/day) YOUR DATA, PRIVATE All drink data stays on your device. Optional Apple Health sync is fully under your control. No accounts, no tracking, no ads. Drink smarter, not just more.