# Morpheus Training vs KetoAir

The clearest difference is rating: Morpheus Training at 4.9 against KetoAir's 1.5. Morpheus Training also leads on update cadence (every 11 days vs every 2 months) and ratings volume (889 vs 2). KetoAir's advantage is monetization model (free vs free with in-app purchases). On price, ads, in-app purchases and device support there is nothing between them.

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

Morpheus Training holds the better App Store score, 4.9 against 1.5. That said, the two scores are not equally well evidenced: Morpheus Training has 889 ratings behind it against 2, so its average is the more settled of the two.

Morpheus Training ships an update every 11 days, KetoAir every 2 months. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Morpheus Training | KetoAir |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (889 ratings)](https://appshunter.io/ios/app/morpheus-training/id1259741445/reviews)** | [1.5 (2 ratings)](https://appshunter.io/ios/app/ketoair/id1671355214/reviews) |
| Number of ratings | **889** | 2 |
| Positive reviews | 58.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 71 MB | 60 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Morpheus Labs INC](https://appshunter.io/developer/1259741444) | [Qi Diagnostics Limited](https://appshunter.io/developer/1636454031) |

## What reviewers say

### Morpheus Training

[App page](https://appshunter.io/ios/app/morpheus-training/id1259741445)

This app optimizes cardio training and recovery by providing personalized heart rate zones and weekly targets. It uses HRV data to guide intensity and volume, helping users improve fitness and conditioning with zone-based interval training.

**Highlights:** Personalized heart rate zones, CardioSmart features, Zone-based interval training (ZBIT), Weekly heart rate zone targets, Daily recovery score, Integrates with wearables and Apple Health Kit

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Morpheus Training free?

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

### Is KetoAir free?

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

### Which has better reviews, Morpheus Training or KetoAir?

Morpheus Training is rated higher. Morpheus Training averages 4.9 out of 5 from 889 ratings, while KetoAir averages 1.5 from 2 ratings.

### Do Morpheus Training or KetoAir have ads?

Neither Morpheus Training nor KetoAir shows ads.

### Which is updated more often, Morpheus Training or KetoAir?

Morpheus Training ships an update every 11 days, and KetoAir every 2 months. Most recently, Morpheus Training was updated on October 24, 2026 and KetoAir on October 6, 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.*