# GKI Tracker vs Ketone Meter Breathalyzer

The clearest difference is review sentiment: GKI Tracker at 59% against Ketone Meter Breathalyzer's 0%. GKI Tracker also leads on rating (3.8 vs 2.0) and ratings volume (16 vs 4). Ketone Meter Breathalyzer's advantage is update cadence (every 2 weeks vs every 5 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.

GKI Tracker holds the better App Store score, 3.8 against 2.0. Both are backed by a comparable volume of ratings — 16 and 4 respectively. Written reviews point the same way: 59% of GKI Tracker's written reviews are positive against 0% of Ketone Meter Breathalyzer's.

GKI Tracker ships an update every 5 months, Ketone Meter Breathalyzer every 2 weeks. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | GKI Tracker | Ketone Meter Breathalyzer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (16 ratings)](https://appshunter.io/ios/app/gki-tracker/id1452955250/reviews)** | [2.0 (4 ratings)](https://appshunter.io/ios/app/ketone-meter-breathalyzer/id6448868757/reviews) |
| Number of ratings | **16** | 4 |
| Positive reviews | **59.1% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | Ad-supported | Ad-supported |
| Size | 36 MB | 47 MB |
| Requires iOS | **13.1** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [Matthias Mellouli](https://appshunter.io/developer/1704897147) | [ReFleX Wireless Inc.](https://appshunter.io/developer/666581212) |

## What reviewers say

### GKI Tracker

[App page](https://appshunter.io/ios/app/gki-tracker/id1452955250)

Track your glucose and ketone levels to calculate your GKI. Sync data with your health app, review your progress in history, and discover keto-friendly foods with a built-in grocery list manager.

**Highlights:** GKI calculation dashboard, Health app data sync, Historical progress tracking, Keto food discovery, Keto grocery list management

**Features:** macOS Compatibility

**In-app purchases:** none


### Ketone Meter Breathalyzer

[App page](https://appshunter.io/ios/app/ketone-meter-breathalyzer/id6448868757)

This app works with a ketone meter device to track your body's fat-burning rate in real-time. It helps you set fitness goals, analyze historical data, and optimize your diet and workouts. Seamlessly sync your data across devices to stay on track with your health journey.

**Highlights:** Real-time fat burning rate tracking, Syncs with ketone meter devices, Personalized fitness insights, Goal setting and historical data analysis, Optimizes workouts and diet plans, Intuitive cross-device syncing

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is GKI Tracker free?

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

### Is Ketone Meter Breathalyzer free?

Ketone Meter Breathalyzer is free to download, with no in-app purchases.

### Which has better reviews, GKI Tracker or Ketone Meter Breathalyzer?

GKI Tracker is rated higher. GKI Tracker averages 3.8 out of 5 from 16 ratings, while Ketone Meter Breathalyzer averages 2.0 from 4 ratings.

### Do GKI Tracker or Ketone Meter Breathalyzer have ads?

Both GKI Tracker and Ketone Meter Breathalyzer show ads.

### Which is updated more often, GKI Tracker or Ketone Meter Breathalyzer?

GKI Tracker ships an update every 5 months, and Ketone Meter Breathalyzer every 2 weeks. Most recently, GKI Tracker was updated on November 2, 2026 and Ketone Meter Breathalyzer on November 4, 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.*