Hydropulse

HydroPulse is the first Wear OS hydration app that doesn't just nag you every hour — it watches what your body is actually doing and tells you to drink when you actually need to. 
MOST HYDRATION APPS GUESS. HYDROPULSE CALCULATES. 
Generic reminder apps divide your daily water goal by the hours you're awake and buzz your wrist on a timer — whether you've been sitting still in an air-conditioned office or sweating through a run in the heat. HydroPulse instead runs a real-time hydration model built from: 
💓 YOUR HEART RATE Elevated heart rate relative to your own resting rate signals exertion — and exertion means fluid loss. HydroPulse reads this straight from your watch's sensor, continuously, in the background. 
🏃 YOUR ACTIVITY Steps, active calories, and exercise sessions tell HydroPulse whether an elevated heart rate means "working out" or "stressed at your desk" — because those call for different amounts of water. 
🌡️ THE WEATHER, WHERE YOU ARE Heat and humidity dramatically change how much you sweat. HydroPulse pulls live local weather and factors in a heat-index-driven sweat estimate — so a humid 34°C afternoon triggers earlier, more frequent reminders than a cool 18°C morning, automatically. 
🧠 A RUNNING HYDRATION BALANCE, NOT A TIMER Instead of "drink 250 mL every hour," HydroPulse maintains a live hydration balance (shown right on your watch face) that only drops below the "you need water" line when your body's actual loss — baseline metabolism + exertion + heat — outpaces what you've had to drink. You'll see exactly how much to drink, and why (heat, exertion, or just time since your last sip). 
FEATURES 
• Adaptive reminders based on heart rate, activity, and live weather — not a fixed interval • At-a-glance hydration % right on your wrist via a watch face complication • One-swipe Tile to check your status and log water without opening the app • Quick-add water logging (100 / 200 / 350 / 500 mL) with one tap from the notification itself • Daily intake history • Quiet hours so you're never woken up for a sip • Snooze when you're in a meeting or can't grab water right now • Personalized to your weight, sweat profile, and heart-rate zones • 100% on-device — no account, no ads, no data selling. See our privacy policy. 
WHO IT'S FOR Runners and cyclists who train outdoors in variable weather. Anyone who's tried a hydration app before and muted it within a week because it buzzed at the wrong times. People who want a health habit that respects context instead of a dumb kitchen timer. 
A NOTE ON WHAT THIS ISN'T 
HydroPulse is a wellness tool, not a medical device — it doesn't measure your blood or sweat chemistry, only heart rate, motion, and weather as proxies for fluid need. If you have a medical condition affecting fluid intake, talk to your doctor about your specific needs. 
HydroPulse is a one-time purchase. No subscription, no in-app purchases, no ads — ever.