Water Zero — Hydration Tracker
One tap widget, drink log
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Most water apps give everyone the same 2 litres and then guilt you into it. That number comes from nowhere — the "eight glasses a day" rule has no scientific source anyone has ever found.
Water Zero starts differently. It works out your goal from your body, and then gets out of the way.
YOUR GLASS, DOWN TO ZERO
The glass on screen holds what's left to drink today, not what you've already had. Every drink lowers the water. Reach zero and the day is done — no confetti, no "keep it up!", nothing to beat.
ONE TAP, NO APP
The widget lives on your home or lock screen. Tap it and a glass is logged. You never open the app to record a drink; the app is where you look at history and change your settings.
A GOAL THAT'S ACTUALLY YOURS
Your target is calculated from your body mass, sex and activity, based on published water-turnover research rather than a round number on a poster. It counts drinks only — roughly a fifth of your water comes from food, and that share is already taken off. Change the number any time. Nothing here is a verdict.
EVERY DRINK COUNTS IN FULL
Coffee and tea hydrate you. There are no penalties, no "caffeine debt", no half-credit. Log the vessel you actually drink from — glass, mug, thermal flask, sports bottle, shaker, espresso cup — or just type an amount.
ZERO OF EVERYTHING ELSE
No account. No sign-up. No servers. No analytics. No ads. No subscription. Your data stays on your phone and is never sent anywhere, because there's nowhere to send it.
Mis-tapped the widget? Undo the last entry from the main screen.
Free forever for logging. That's the whole app.
Ratings & Reviews
The developer, Koodalabs LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Koodalabs LLC
- Size
- 6.3 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © Koodalabs