Comparison

H2O vs WaterFlow

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

H2O

This application helps you monitor your daily water consumption to ensure you stay adequately hydrated. It offers a visually appealing interface with features for quickly logging intake and reviewing your progress.

Highlights
  • Log water intake quickly
  • Preset water amounts
  • Weekly intake graph
  • Full history of entries
  • HealthKit integration
  • Intuitive interface
Features
Read full description

Most water apps give you the same goal every day. H2O raises yours on hot days and after workouts, so you drink what your body actually needs. Log a glass in one tap from your iPhone, Apple Watch or Home Screen, and watch your streak grow on the calendar. H2O makes staying hydrated the easiest habit you'll build. H2O has helped people stay hydrated since 2016, and version 2.0 is rebuilt from the ground up. FEATURES ◉ Daily goals that adapt to the local weather and your workouts in Apple Health. ◉ Quickly add entries with preset water amounts, or enter a custom amount. ◉ An Apple Watch app with complications for your watch face. ◉ Home Screen widgets that log water with one tap. ◉ Gentle reminders to drink throughout the day. ◉ A calendar that shows every day you hit your goal. ◉ Charts of your weekly and monthly water intake. ◉ A full history of water entries. ◉ Apple Health integration and iCloud sync across your devices. ◉ Export your water history as a PDF. ◉ Track in ounces or milliliters. ◉ Support for VoiceOver, Voice Control, Larger Text and Reduced Motion. ◉ A beautiful and intuitive interface! H2O PRO H2O requires H2O Pro, available as a monthly or yearly auto-renewing subscription, or as a one-time lifetime purchase. The yearly plan includes a 7-day free trial for eligible new subscribers. If you used H2O before version 2.0, the app stays free for you, and H2O Pro adds adaptive goals and PDF export. Payment is charged to your Apple Account. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. You can manage or cancel your subscription anytime in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ H2O Terms: https://lunarbits.io/terms.html Privacy Policy: https://lunarbits.io/privacy.html

About

WaterFlow

This app helps you maintain consistent hydration with smart reminders, quick logging, and insightful tracking. It offers features like custom schedules, Apple Watch integration, and progress monitoring to encourage healthy habits.

Highlights
  • Smart, customizable reminders
  • Fast water logging with custom sizes
  • Track on Apple Watch, widgets, and Live Activity
  • Recover missed entries
  • Hydration insights and progress tracking
  • Apple Health sync
Features
Read full description

Never forget hydration again. WaterFlow helps you stay consistent through busy workdays with smarter reminders, fast water logging, and long-term hydration insights across iPhone, iPad, and Apple Watch. SMART REMINDERS THAT FIT REAL LIFE Set your wake and sleep hours, choose your interval, and build a reminder schedule that respects your day instead of spamming it. FAST WATER LOGGING Add water in seconds with custom cup sizes, widgets, Live Activity, and Apple Watch support. Log in ml or oz and keep your daily goal visible. RECOVER MISSED TRACKING Forgot to log a drink earlier? Add past entries quickly and keep your history accurate even on hectic days. PROTECT YOUR STREAK Stay motivated with streaks, achievements, and progress that make consistency feel rewarding instead of repetitive. HYDRATION INSIGHTS THAT MATTER See daily, weekly, and monthly patterns, understand your routine, and spot what actually helps you drink enough water. APPLE WATCH, WIDGETS, AND LIVE ACTIVITY Track from your wrist, your Home Screen, your Lock Screen, and Dynamic Island without opening the app every time. APPLE HEALTH SYNC Write your water intake to Apple Health and keep your hydration data connected to the rest of your wellness routine. PREMIUM Unlock advanced stats, Apple Watch sync, backup export/import, achievements, and a clean ad-free experience with Monthly, Yearly, or Lifetime options. PRIVACY FIRST WaterFlow does not sell your data. Your hydration history stays under your control. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://hknfrt.github.io/privacy

Screenshots

H2O4 screens
WaterFlow4 screens

Verdict

The call

The clearest difference is rating: H2O at 4.5 against WaterFlow's 3.0. H2O also leads on ads (none vs shown) and update cadence (every 3 days vs every 2 weeks). WaterFlow's advantage is review sentiment (100% vs 85%) and iOS requirement (17.0 vs 26.0). On price, in-app purchases, monetization model and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. H2O sells 4 in-app purchases, starting at $1.99 per month and WaterFlow sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

H2O holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: H2O has 175 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 85% of H2O's written reviews are positive against 100% of WaterFlow's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

H2O ships an update every 3 days, WaterFlow every 2 weeks. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

Scorecard6 real differences · 4 level
H2O versus WaterFlow: the parameters behind the verdict, then further details
ParameterH2OWaterFlow
PriceFreeFree
Rating4.5 (175 ratings) — better3.0 (1 ratings)
Positive reviews84.9% of reviews100.0% of reviews — better
Number of ratings175 — better1
Update frequencyEvery 3 days — betterEvery 2 weeks
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFreeFree
DevicesiPhone, Apple WatchiPhone, iPad, Apple Watch — better
Requires iOS26.017.0 — better
Further details — not scored
Size48 MB16 MB
Age rating12+4+
DeveloperLunarbits LLCHakan FIRAT

Customer experience

H2O

All ratings129 ratings
Positive86.8%
Neutral3.9%
Negative9.3%
Written reviews53 reviews
Positive84.9%
Neutral1.9%
Negative13.2%

WaterFlow

Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

H2O

Reported bugs

5 issues
  • App crashes when accessing settings
  • App shuts off when accessing settings
  • Graph feature not working
  • App closes when goal is reached
  • Glitches when reaching goal

Requested features

20 requests
  • Add reminder notifications
  • Allow editing of previous day's entries
  • Add metric units (ml/L)
  • Add widget support
  • Add export to HealthKit option
Show 15 more
  • Add ability to flip to a second profile
  • Add Apple Watch integration
  • Add dark mode
  • Add support for other beverages (coffee, tea)
  • Add Shortcuts support
  • Fix app closing when goal is reached
  • Fix glitches when reaching goal
  • Clarify how to delete entries
  • Add total fluid intake of previous days by each day in history
  • Allow changing the date/time of an entry
  • Allow the app to read HealthKit data
  • Automatically update daily goal with age, weight, and gender
  • Refine daily goal with location and activity data
  • Add a way to donate to the developer
  • Screen adjustment sizes for newer iPhones

WaterFlow

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

H2O

Subscriptions3
  • H2O Pro Monthly2 variants$1.991 Month
  • H2O Pro Yearly7 Days trial$9.991 Year
  • H2O Pro Yearly$9.991 Year
One-time1
  • H2O Pro Lifetime2 variants$19.99
3 purchases

WaterFlow

Subscriptions2
  • Premium Monthly$2.991 Month
  • Premium Yearly3 Days trial$14.991 Year
One-time1
  • Premium Lifetime$29.99

Questions

Is H2O free?
H2O is free to download, with in-app purchases available.
Is WaterFlow free?
WaterFlow is free to download, with in-app purchases available.
Which has better reviews, H2O or WaterFlow?
H2O is rated higher. H2O averages 4.5 out of 5 from 175 ratings, while WaterFlow averages 3.0 from 1 ratings.
Do H2O or WaterFlow have ads?
WaterFlow shows ads; H2O does not.
Which is updated more often, H2O or WaterFlow?
H2O ships an update every 3 days, and WaterFlow every 2 weeks. Most recently, H2O was updated on November 2, 2026 and WaterFlow on October 30, 2026.

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