Water Reminder vs Hydrium
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Water Reminder
This app helps you stay hydrated by reminding you to drink water based on your body's signals, rather than just tracking intake. It offers customizable notifications and integrates with Apple Health, providing a simple way to build healthy habits and monitor your well-being.
- Drink water reminders based on body signals
- Apple Watch and Lock Screen widgets
- Customizable notifications
- Apple Health integration
- Hydration calendar (pee count)
- Data export and social features
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P is a water reminder for iPhone and Apple Watch that doesn’t make you log every glass. You log a bathroom visit in seconds, and P reminds you to drink water when it’s been a while. P tracks output, not intake: peer-reviewed studies support 24-hour pee frequency as a practical hydration indicator in healthy adults. P also works as a bladder diary to track how often you pee: log each bathroom visit from your iPhone or Apple Watch, add notes, and keep a record to discuss with your doctor. It’s great for Apple Watch or as a Lock Screen Widget, and not as complicated as a water tracker. Who wants to use an annoying, complicated water tracker to drink water? Up your hydration game with this app! Try it out, and see how this drink water reminder app can keep you aware of your body. Key features: - Drink water when your body needs it most, instead of based on just water intake - Great Apple Watch app: Put it on your watch face for fast access while you head to the restroom! - Customizable drink water reminder notifications - Apple Health integration - Lock Screen widgets - Home Screen widgets - Hydration calendar (pee count per day) - Add notes on pees - Volume tracking: record void volume in mL or oz for a complete voiding diary - See Where You Peed: include location on pees for a low-effort journal of your life - Tell Siri to “Log a P” - Data export as CSV - Supported by scientific research - Add friends so you can remind them to drink water - Earn your scroll: Water Break blocks apps you choose until you take a sip of water If you’ve ever had a UTI or kidney stones, you know how important it is to drink water. Hydration is so important! There can be many benefits of drinking water, like weight loss, healthy skin, mental clarity, and much more. Dehydration can hold you back from being your best self. Now it’s easy to know when it’s water time. This hydration app gets you in tune with your body, especially when you need to drink water most. P is like a fitness game, taking the water tracker concept and turning it around, so you don’t need to track water intake. It’s a much simpler free water drinking reminder app. Don’t break that streak! You can even see where you stack up against the streaks of other users on the Leaderboard. Even though P is designed to help you drink water as a hydration app and water drinking reminder app, you may also want to use it as a simple pee tracker or bathroom tracker. With volume tracking, P supports proper voiding diaries that medical providers request. This can be helpful for tracking data related to prostate conditions, bladder conditions, avoiding UTIs, avoiding kidney stones, and more. Remember, this is not a water tracker! There is no way to record when you drink water, or how much water you drink. Instead, it’s a hydration app based on how often you pee! Join the many happy users who have used P to drink water and monitor their hydration based on how often they pee instead of a water tracker! P does not provide medical advice. It is not intended to diagnose or treat any medical conditions. It’s just a fun way to remember to drink more water or track your pees. Ask a licensed medical professional if you have any questions about: - kidney stones - gout or other types of inflammatory arthritis - prostate conditions, or BPH - interstitial cystitis and bladder conditions - urinary tract infections (UTI) - getting well-hydrated to prevent hangovers - pelvic floor training and Kegel exercises to control urinary incontinence - postural orthostatic tachycardia syndrome (POTS) P includes optional subscriptions. Subscriptions are charged to your App Store account and renew automatically unless canceled before the current period ends. You can turn off auto-renewal in Settings after purchase. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ P was formerly called Pee & See.
Hydrium
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Hydrium helps you drink enough water every day, without having to think about it. During setup, Hydrium calculates your daily goal from your weight, activity level and climate, with adjustments for pregnancy, breastfeeding, workouts and hot weather. SIMPLE TRACKING • Log a drink in one tap: glass, mug, flask, bottle or a free amount • 4 animated visuals to watch your progress: bottle, silhouette, plant, ring • Drink type (water, tea, coffee, juice, soda...) is factored into your real hydration SMART REMINDERS • Reminders at a regular interval or at fixed times • Adaptive reminders: Hydrium automatically spaces out the reminders left in your day based on the time and how much you still need to drink • Automatic snooze after a large drink, reminders pause once you reach your goal HISTORY AND MOTIVATION • 7-day, 30-day, 12-month and all-time history • Charts and a breakdown by beverage • 12 badges to unlock, day streaks APPLE WATCH AND HEALTH • Full companion app for Apple Watch, synced with your iPhone in real time • Watch face complication: progress ring and volume in ml (circular, corner, rectangular and inline) • Your drinks are written to the Health app automatically • Reads your weight and workouts to refine your goal AUTOMATIC ICLOUD BACKUP • Optional, turned on in Settings › Data: a daily copy of your data in your iCloud Drive (Hydrium folder in the Files app), the 7 latest are kept • Restore from iCloud in a few taps, after a reinstall or on a new iPhone • Your data stays in your own iCloud account: Hydrium has no server • Manual backup and restore (JSON file) are still available 14-DAY FREE TRIAL • Try every Hydrium Plus feature free for 14 days, no subscription • When the trial ends, the app returns to the free version: your data is kept, and the containers, beverages and styles created during the trial stay hidden until you buy Hydrium Plus HYDRIUM PLUS (one-time purchase, no subscription) • Unlimited history (30 days, 12 months, all-time) • Unlimited custom containers and beverages • All 4 visual styles • Smart and adaptive reminders • Themed sounds • CSV export Available in English, French, Italian and Spanish. Units: milliliters, liters or ounces. Hydrium offers a comfort estimate to help you stay hydrated day to day; it does not replace medical advice.
Screenshots
Verdict
Water Reminder and Hydrium are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Water Reminder sells 7 in-app purchases, starting at $4.99 per month and Hydrium sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Water Reminder ships an update every 6 days, Hydrium every 4 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.
| Parameter | Water Reminder | Hydrium |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (1.9K ratings) — better | — |
| Positive reviews | 88.5% of reviews | — |
| Number of ratings | 1.9K — better | — |
| Update frequency | Every 6 days | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 98 MB | 9 MB |
| Age rating | 9+ | 4+ |
| Developer | Ganotis Holdings, Inc. | Christophe Fromage |
Bugs and requests
Water Reminder
Reported bugs
3 issues- Apple Watch app not working after update
- Pee data disappearing after update
- Inconsistent time tracking between app and widget
Requested features
4 requests- Add ability to track urine color and volume
- Pause tracking during sleep
- Customizable hydration targets
- Export data to other health apps
Hydrium
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Water Reminder
- Monthly Subscription$4.991 Month
- Yearly Subscription7 Days trial$39.991 Year
- Streak Lie: 7–29 Days$0.49
- Streak Lie: 30–59 Days$4.99
- Streak Lie: 60–89 Days$8.99
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- Streak Lie: 90+ Days$19.99
- Lifetime Access$119.99
Hydrium
- 14-day TrialFree
- Hydrium Plus$2.99









