Hydra – Water Tracker
Net hydration, drink by drink.
Track the water your body actually keeps. Coffee, milk and alcohol count differently, and your goal adapts every day to your workouts and the weather.
What Hydra does
Every drink, weighed
Water, coffee, tea, juice, milk, sports drinks, electrolytes, beer, wine and spirits each count by a factor from published studies.
Alcohol, offset
Alcohol counts against you, and Hydra tells you how much water brings it back.
A goal made for you Pro
From your weight, sex, activity and climate. Tap it to see how it’s calculated, line by line, or set your own.
A goal that adapts Pro
Workouts from Apple Health and today’s weather add water to today’s goal, and the breakdown shows how much.
Stay on pace
Today shows where you are against where you should be by this hour. Log a drink in one tap.
Your history Pro
Day, week, month, six months and year: averages, streaks, consistency and which drinks helped most.
Smart reminders Pro
Only after a while without a drink, only in your active hours, and never after you reach your goal.
Apple Watch and widgets
Log from your wrist, add Hydra to your watch face, and see your progress on the Home Screen and Lock Screen.
Apple Health
The water from every drink is saved to Apple Health, and your weight is read from it.
Private by design
No account, no ads, no tracking. Your data stays on your devices and, with iCloud sync, in your own iCloud.
Free and Pro
Free
- Log every drink
- Today’s net hydration
- A standard 2,500 ml goal
- The Apple Watch app
Hydra Pro
- Your personal goal, adapting to workouts and weather
- Your full history and CSV export
- Smart reminders
- Your own cups
- iCloud sync
| Hydra Pro | Price |
|---|---|
| Yearly, with a 3-day free trial | $19.99 / year |
| Monthly | $3.99 / month |
| Lifetime, a one-time purchase | $39.99 |
Prices in US dollars; the App Store shows your local price. Payment, cancelling and refunds are handled by Apple. More about Hydra Pro
Questions
- How much water should I drink a day? Try the calculator
- What is net hydration?
- How does the daily alcohol limit work?
- How much water should you drink after alcohol?
- Does coffee dehydrate you?
- How is my daily goal calculated?
- How do reminders work?
- Does Hydra work with Apple Health and iCloud?
- Contact support
Hydra gives general estimates for healthy adults and is not medical advice. If you have a medical condition, follow your doctor’s guidance on fluids.