Water Reminder App Without the Water Tracking 💧
P Water App: Science-Backed Hydration App for iPhone & Apple Watch
Tap a button on your way to pee. Get water reminders when your body needs them most to form a healthy hydration habit. 7+ bathroom visits a day = properly hydrated.
Science-Backed
Research shows 7+ pees a day means you're staying hydrated.
Two-Second Simplicity
Log on your way to the bathroom. That's it.
Habit That Sticks
Easier to remember than tracking every glass of water.
Privacy-First
Private by design. Your data is only on your device and in your private iCloud account.
Medical Tracking
Can be used to manage symptoms related to UTIs, overactive bladder, BPH, and kidney stones.
Friends & Accountability
Stay accountable. Remind each other to drink water when you need it most.
Log in 2 seconds on your way to the bathroom, without taking out your phone. Watch face complications let you keep an eye on your hydration throughout the day.
What Users Say
Great App!
I'm so glad I found this app. At my advanced age I have prostate/bladder issues... Instead of telling the doctor 'I seem to be having to pee very frequently', the gives you hard data that you can show to your urologist.
So helpful!
I have used this every day for over 5 years and it has helped my hydration habits/caffine intake!
Helpful & Easy
Being able to set as an interactive widget makes it that much easier to log. I struggle to remain consistent when it comes to keeping logs. This app makes it super easy to do just that!
Super helpful
App is super easy to use, seamless friend invites, and cool features! Very helpful to make sure I am drinking enough water
Great app!
I use this app all the time and just love it! Recently I was having an issue and contacted the developer about it. The response was immediate and the issue was able to be fixed. Great customer service!! 👏🏻😊
Like it so far
Easy to use on my watch. Just what I needed.
Backed by Peer-Reviewed Research
P's methodology is validated by scientific studies published in leading journals.
24-h void number as an indicator of hydration status
European Journal of Clinical Nutrition (2015)
Key Finding: Euhydrated individuals void 5±2 times vs hypohydrated 3±1 times per 24 hours
Combining urine color and void number to assess hydration
European Journal of Nutrition (2021)
Key Finding: Void number is a valid field-measure to detect underhydration
Reliability of 24-h void frequency as an index of hydration status
European Journal of Clinical Nutrition (2016)
Key Finding: Well-hydrated individuals average 7±2 voids/day vs 5±2 when dehydrated
Urinary frequency and perceived thirst identify adequate fluid intake
Journal of the American College of Nutrition (2020)
Key Finding: 6 or fewer daily bathroom visits indicates suboptimal hydration
Hydration for health hypothesis: a narrative review
European Journal of Nutrition (2020)
Key Finding: Recommends 5-7 voids daily as a practical hydration marker
Development of individual hydration strategies for athletes
International Journal of Sport Nutrition and Exercise Metabolism (2008)
Key Finding: "Hydration status can be assessed from urine frequency and volume"
We all know that drinking water is important. A well-timed water reminder can help motivate you to develop good habits. There are studies that measure how water consumption can contribute to weight loss, control BPH (prostate issues), reduce kidney stones, and improve overall health and fitness.
But tracking daily water intake in water tracker apps is annoying and prone to error.
Not a Water Tracking App
Most water reminder apps, like WaterMinder, Waterllama, Plant Nanny, Hydro Coach, Aqualert, and Waterbalance are water trackers. They ask you to set daily goals or are based on a certain water drinking schedule.
P is a different kind of water app. It's designed to be one of the easiest ways to get reminders to drink water with minimal work. You don't need to set any water goals, use a customized cup or special water bottle, or even track your daily intake. It's not a water tracking app at all — it's possibly the best water reminder app.
With P, all you need to do is tap one button every time you go to the bathroom, and you'll get a reminder to drink water when it's been over three hours since you peed.
The Best Water Reminder App
The amount of H2O you should be drinking depends on a number of factors, like your body weight, body temperature, or the amount of physical activity you do on a particular day.
Unlike most drinking water apps, P can keep you on track with water consumption and keep you more aware of your body's response to different foods, weather, and beverages based on your output rather than water intake. There's a graphic display that shows stats about the average time between your pees, both in the long and short term, so you can see how you're doing over time.
Pee tracking isn't conventional. You won't find the ability to track your pees in the Apple Health app or Google Fit, but P may be the best water reminder app for you. It provides relevant water reminders with minimal input.
Want to know whether it's a great app? Check out the user reviews in the App Store.
Available for iPhone and Apple Watch
Right now, P is available in the App Store for iPhone and Apple Watch. In the future, it may also be available for Android and Android Wear in the Google Play store. Try it out today!
P was formerly called Pee & See.
Frequently Asked Questions
How It Works
P measures hydration based on urination frequency instead of water intake. Research shows that well-hydrated individuals pee more frequently throughout the day. Simply log each visit on your way to the bathroom, and P automatically assesses your hydration status and reminds you to drink water without water intake tracking.
Unlike traditional water reminder apps that estimate hydration based on intake, P tracks your actual output frequency. This method accounts for differences in metabolism, activity level, and environmental conditions.
Bathroom frequency is scientifically-backed as a good way to measure hydration status for most people, while water intake is just an estimate. Your body's water needs vary based on activity, weather, and metabolism. Generic "8 glasses a day" advice doesn't account for this.
Traditional water tracking apps require you to log every glass, estimate serving sizes, and follow one-size-fits-all recommendations. By tracking bathroom visits, P measures your body's actual hydration state, automatically adjusting for your unique circumstances.
P uses 7+ daily bathroom visits as its hydration target. Research shows well-hydrated individuals average around 5-7 bathroom visits daily. P's target of 7 represents the well-hydrated end of this range.
The goal isn't about forcing bathroom trips: it's about confirming your hydration through natural frequency. If you're reaching 7+ visits during waking hours, you can be confident you're well-hydrated.
Bathroom tracking is scientifically validated as a reliable hydration indicator. Peer-reviewed research has demonstrated that urinary frequency correlates with hydration biomarkers. It's more accurate than intake estimation because it measures actual body feedback rather than guessing fluid needs.
No. P eliminates the need to track water intake. You only log bathroom visits, which are used as a proxy for hydration. Just tap the app on your way to the bathroom... that's it!
Using P is simple: download the free app for iPhone or Apple Watch, then tap the button each time you're on your way to the bathroom. P tracks your daily visits toward the 7+ goal and sends smart reminders if you're falling behind.
After downloading from the App Store, P works immediately: no complex setup required. You can log visits from your iPhone, Apple Watch, or widgets on your home screen or lock screen.
Effective strategies include: keep a water bottle accessible throughout the day, drink a glass with each meal, set regular reminders, flavor water with fruit if plain water is unappealing, and eat water-rich foods.
Staying hydrated with alcohol: Drinking water before and during alcohol consumption can help reduce hangover symptoms. P can help you stay aware of your hydration status when drinking.
Scientific Validation
P's methodology is based on peer-reviewed hydration research demonstrating urinary frequency as a validated biomarker. Studies by Dr. Stavros Kavouras and colleagues have shown that bathroom visit frequency correlates with hydration status.
Dr. Stavros Kavouras is a leading hydration researcher and professor at Arizona State University who has published 170+ peer-reviewed papers on hydration science. He ranks in the Top 2% of cited scientists globally in his field and is the Founding Director of the Hydration Science Lab.
P is the only hydration app that measures actual hydration through bathroom visits instead of estimating needs based on water intake. While other apps guess your requirements, P measures your body's output, providing hydration assessment without manual logging of every beverage.
Yes, for most healthy people. Multiple peer-reviewed studies have validated urinary frequency as a practical hydration biomarker. While not as precise as laboratory urine tests, bathroom frequency provides a reliable, non-invasive method for daily hydration monitoring.
Medical Applications
Yes. P functions as a digital voiding diary for medical purposes. Healthcare providers often recommend voiding diaries to track urinary frequency, patterns, and potential bladder issues.
Medical uses include: UTI monitoring, overactive bladder assessment, interstitial cystitis tracking, BPH/prostate health monitoring, and medication effectiveness evaluation.
Note: P is designed for personal wellness tracking. Always consult healthcare professionals for medical diagnosis and treatment.
P helps monitor hydration, which is important for UTI prevention. Adequate hydration helps flush bacteria from the urinary tract. By tracking bathroom frequency, P helps you stay aware of your hydration patterns.
Medical Disclaimer: P is not medical advice. Consult healthcare providers for UTI prevention, diagnosis, and treatment.
Yes. P helps monitor bladder patterns that may indicate health changes. Sudden increases or decreases in bathroom frequency, nighttime pattern changes, or inconsistent daily totals can signal bladder issues worth discussing with healthcare providers.
Yes. Healthcare providers frequently recommend voiding diaries for patients with urinary symptoms, chronic UTIs, bladder conditions, or hydration-related issues.
Medical contexts include: urology consultations, UTI prevention, overactive bladder treatment, kidney stone prevention, BPH/prostate health, gout management, and POTS management.
Features & Technical
Yes. P includes full Apple Watch integration with a native watchOS app. It has complications for watch faces to monitor your hydration and quickly access the app for 2-second logging from your wrist.
Many users (40%+) use the Apple Watch app.
Core Features (Free):
- One-tap bathroom visit logging from iPhone, Apple Watch, or widgets
- Smart water reminders when it's been over 3 hours since you peed
- Statistics showing average time between pees
- Hydration calendar view
- Apple Watch app with complications
- iPhone widgets (lock screen, home screen)
- iCloud sync across all your devices
- Friend water reminders & leaderboard
- See Where You Peed map view
- Streak tracking
Premium Features (optional subscription):
- Add notes to pees (amount, urgency, color, etc.)
- Calendar for older months
- Stealth Mode (hide "pee" throughout app)
- CSV export for sharing with doctors
- Custom app icons
- Reminder customization
- Snooze reminders
Yes. P is designed with privacy-first principles. Your data is stored on your device, and backed up and synced privately to your iCloud account in a way that it can't even be accessed by the developer of the app. It can't be sold to third parties or used for any other reason by anyone else.
Yes. P reads handwashing events from Apple Health to help you catch bathroom visits you may have forgotten to log. When your Apple Watch detects handwashing, P can prompt you to confirm whether it was a bathroom visit.
This is an optional feature that can be enabled/disabled in P's settings. P does not write any data to Apple Health.
Pricing & Download
Yes. P Water App is free to download and use. The core hydration tracking experience is completely free with no time limits or trials.
Most users find the free version completely sufficient for daily hydration tracking. There's also an optional premium subscription for power users who want additional customization.
Premium subscription unlocks additional customization and data features: add notes to pees, calendar for older months, Stealth Mode, CSV export, custom app icons, reminder customization, and snooze reminders.
Subscription options: Monthly, yearly, or lifetime. All support Family Sharing.
Download P Water App free from the App Store. Search "p water app" or tap the download button above. Requires iPhone running iOS 17 or later. Also available for Apple Watch (requires watchOS 8+).
After downloading, the app works immediately: no complex setup, no account creation required.