# KetoAir vs ECHO Water

The clearest difference is rating: ECHO Water at 4.6 against KetoAir's 1.5. ECHO Water also leads on ratings volume (141 vs 2) and update cadence (every 3 weeks vs every 2 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

ECHO Water holds the better App Store score, 4.6 against 1.5. That said, the two scores are not equally well evidenced: ECHO Water has 141 ratings behind it against 2, so its average is the more settled of the two.

KetoAir ships an update every 2 months, ECHO Water every 3 weeks. The most recent releases landed on October 6, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | KetoAir | ECHO Water |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.5 (2 ratings)](https://appshunter.io/ios/app/ketoair/id1671355214/reviews) | **[4.6 (141 ratings)](https://appshunter.io/ios/app/echo-water/id6739596759/reviews)** |
| Number of ratings | 2 | **141** |
| Positive reviews | — | 20.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 60 MB | 49 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Qi Diagnostics Limited](https://appshunter.io/developer/1636454031) | [Echo Water](https://appshunter.io/developer/1786253277) |

## What reviewers say

### KetoAir

[App page](https://appshunter.io/ios/app/ketoair/id1671355214)

This device and companion app help you monitor your body's fat-burning status by measuring acetone levels in your breath. Get instant, accurate results to understand how your diet and exercise affect your ketosis.

**Highlights:** Instant breath acetone measurement, Accurate real acetone sensor, Bluetooth device connectivity, Log ketosis records, Monitor fat-burning status, Track diet and exercise impact

**Features:** macOS Compatibility

**In-app purchases:** none


### ECHO Water

[App page](https://appshunter.io/ios/app/echo-water/id6739596759)

This app provides a streamlined and dependable interface for operating your Echo Flask. It offers a simplified user experience for managing hydrogen water generation.

**Highlights:** Simplified operation, Reliable performance, Echo Flask management, Hydrogen water generation

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 🚀 Sleek and compact design
- 💡 Customizable color options

**What reviewers complain about**

- 🐛 Connectivity issues with app
- 🐛 Inaccurate water tracking
- 🐛 Firmware update problems
- 🔋 Unreliable battery life

**Reported bugs**

- App unable to sync with water bottle
- Inconsistent flask counting
- Bluetooth pairing problems

**Requested features**

- Ability to manually log water intake
- Scheduling options for hydrogen water
- Improved app performance and stability


## Frequently asked questions

### Is KetoAir free?

KetoAir is free to download, with no in-app purchases.

### Is ECHO Water free?

ECHO Water is free to download, with no in-app purchases.

### Which has better reviews, KetoAir or ECHO Water?

ECHO Water is rated higher. KetoAir averages 1.5 out of 5 from 2 ratings, while ECHO Water averages 4.6 from 141 ratings.

### Do KetoAir or ECHO Water have ads?

Neither KetoAir nor ECHO Water shows ads.

### Which is updated more often, KetoAir or ECHO Water?

KetoAir ships an update every 2 months, and ECHO Water every 3 weeks. Most recently, KetoAir was updated on October 6, 2026 and ECHO Water on October 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*