# Ketonix vs WeighSync

The clearest difference is rating: Ketonix at 2.3 against WeighSync's 1.0. Ketonix also leads on review sentiment (20% vs 5%) and iOS requirement (10.0 vs 14.0). On price, ratings volume, update cadence and ads there is nothing between them.

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

Ketonix holds the better App Store score, 2.3 against 1.0. Both are backed by a comparable volume of ratings — 6 and 3 respectively. Written reviews point the same way: 20% of Ketonix's written reviews are positive against 5% of WeighSync's.

Ketonix ships an update every 5 weeks, WeighSync every 3 weeks. The most recent releases landed on June 11, 2026 and August 29, 2026 respectively.

## The numbers

| Metric | Ketonix | WeighSync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.3 (6 ratings)](https://appshunter.io/ios/app/ketonix/id1239051593/reviews)** | [1.0 (3 ratings)](https://appshunter.io/ios/app/weighsync/id6458537754/reviews) |
| Number of ratings | **6** | 3 |
| Positive reviews | **20.0% of reviews** | 4.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 90 MB | 31 MB |
| Requires iOS | **10.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [M Object Oriented Software Engineering AB](https://appshunter.io/developer/498983792) | [Conmo Electronic Company Limited](https://appshunter.io/developer/1329893148) |

## What reviewers say

### Ketonix

[App page](https://appshunter.io/ios/app/ketonix/id1239051593)

This app measures and analyzes breath ketone data from a connected Bluetooth device. It displays trendlines, moving averages, and allows for annotations of lifestyle changes to track progress. Video guides are available for various functions.

**Highlights:** Measure breath ketone data, Analyze ketone trends, Display moving averages, Add lifestyle annotations, Register Bluetooth device, Create user profiles

**Features:** macOS Compatibility

**In-app purchases:** none


### WeighSync

[App page](https://appshunter.io/ios/app/weighsync/id6458537754)

This app simplifies weight tracking by connecting to smart scales via Bluetooth. It allows users to easily record and visualize their weight data without requiring registration or an internet connection, prioritizing user privacy.

**Highlights:** Bluetooth smart scale connection, Weight data recording, Weight data visualization, No registration required, Offline functionality, User data privacy

**In-app purchases:** none


## Frequently asked questions

### Is Ketonix free?

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

### Is WeighSync free?

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

### Which has better reviews, Ketonix or WeighSync?

Ketonix is rated higher. Ketonix averages 2.3 out of 5 from 6 ratings, while WeighSync averages 1.0 from 3 ratings.

### Do Ketonix or WeighSync have ads?

Neither Ketonix nor WeighSync shows ads.

### Which is updated more often, Ketonix or WeighSync?

Ketonix ships an update every 5 weeks, and WeighSync every 3 weeks. Most recently, Ketonix was updated on June 11, 2026 and WeighSync on August 29, 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.*