Comparison

WellO2 vs Replenish

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

Head to head
About

WellO2

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Breathe smarter with the WellO2 MyBreath smart mouthpiece! WellO2 MyBreath is a smart mouthpiece for your WellO2 device. It allows you to measure and monitor lung respiratory muscle strength, airflow in the bronchial tubes and total respiratory capacity. With the device, you can now measure, monitor and improve your breathing in an unprecedented way at home! The MyBreath smart mouthpiece works with the WellO2 app and is used like a normal WellO2 mouthpiece. The app offers a wide range of exercises to suit different needs, such as relieving nasty cold symptoms, strengthening your breathing muscles, conditioning your voice before an important performance or calming your mind before bedtime. A wide range of exercises makes WellO2 breathing even more exciting! WellO2 MyBreath โ€“ Breathe Smarter

About

Replenish

This app helps you build a consistent water-drinking habit with a simple, quiet interface. It calculates your personal hydration goal and offers easy logging, with optional, non-intrusive reminders. Designed for focus and privacy, it keeps all your data on your device.

Highlights
  • Personalized daily hydration goal calculation
  • One-tap water logging
  • Friendly drop mascot visualizer
  • 30-day progress tracking
  • Optional customizable reminders
  • Light and dark mode
Features
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Replenish is a calm, beautifully designed water tracker built for one purpose: helping you actually drink enough water โ€” every day, without the noise of typical health apps. No streaks shaming you. No aggressive notifications. No account. Just water, you, and a habit worth keeping. HOW IT WORKS Open the app. Tap +250ml. Watch your drop fill up. That's it. Behind the simplicity, Replenish does the heavy lifting: it calculates your personal daily hydration goal from your weight, sex assigned at birth, and activity level โ€” so you always know exactly how much water your body needs today. WHAT'S INSIDE - Daily target tailored to you โ€” auto-calculated, or set your own manually - One-tap logging โ€” quick +250ml, custom amount, or undo your last entry - A friendly drop mascot that fills up as you drink, with smooth animations - Today view โ€” total intake, percentage to goal, average per sip, and your timeline - 30-day tracker โ€” see active days, daily average, total intake, and goals met - Streak counter for days you logged water - Optional reminders every 60, 90, or 120 minutes - Light and dark mode automatically PRIVATE BY DESIGN - Everything stays on your device โ€” no cloud, no servers, no exceptions - No account, no sign-up, no email required - No tracking, no analytics, no third-party sharing - Reset all your data anytime with a single tap QUIET, NOT PUSHY Reminders are off by default. If you turn them on during setup or later, you choose the rhythm. We ask for notification permission only after onboarding โ€” and if you say no, reminders stay off without nagging. DESIGNED FOR FOCUS Replenish opens directly on the screen that matters: today's hydration. A discreet menu in the top corner takes you to your tracker or settings whenever you want โ€” never in your way. WHO IT'S FOR Anyone who wants a beautiful, low-effort way to drink more water consistently. Whether you're an athlete, busy professional, parent, student, or someone simply trying to feel better day to day โ€” Replenish meets you where you are and asks nothing more. WHAT IT IS NOT Replenish is a wellness habit-tracking tool. It is not a medical app and does not provide medical advice. It is not intended to diagnose, treat, or replace professional healthcare guidance. Always consult a qualified healthcare provider for medical questions or before making changes to your routine. GET STARTED IN 60 SECONDS Four short steps. Then you're done setting up โ€” and Replenish quietly does its job from there. Replenish. Drink. Repeat. Feel better. Privacy policy : https://replenish-app.com/privacy Terms : https://replenish-app.com/privacy#terms

Screenshots

WellO24 screens
Replenish3 screens

Verdict

The call

The clearest difference is iOS requirement: WellO2 at 12.0 against Replenish's 15.1. On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Scorecard1 real difference ยท 7 level
WellO2 versus Replenish: the parameters behind the verdict, then further details
ParameterWellO2Replenish
PriceFreeFree
Positive reviewsโ€”100.0% of reviews
Update frequencyEvery 6 weeksโ€”
AdsNoNo
In-app purchasesNoNo
Monetizationโ€”Free
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 โ€” better15.1
Further details โ€” not scored
Size54 MB29 MB
Age rating12+4+
DeveloperWellO2 OySouhail Zaki

In-app purchases

None

WellO2

No in-app purchases

None

Replenish

No in-app purchases

Questions

Is WellO2 free?
WellO2 is free to download, with no in-app purchases.
Is Replenish free?
Replenish is free to download, with no in-app purchases.
Do WellO2 or Replenish have ads?
Neither WellO2 nor Replenish shows ads.

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