# Ketonix vs RayLimit

The clearest difference is in-app purchases: Ketonix at none against RayLimit's 2. Ketonix also leads on update cadence (every 5 weeks vs every 3 months) and iOS requirement (10.0 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. RayLimit sells 2 in-app purchases, starting at $3.99 per month. Ketonix asks for nothing beyond the download.

Ketonix ships an update every 5 weeks, RayLimit every 3 months. The most recent releases landed on October 8, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Ketonix | RayLimit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.3 (6 ratings)](https://appshunter.io/ios/app/ketonix/id1239051593/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Monetization | Free | — |
| Size | 90 MB | 140 MB |
| Requires iOS | **10.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [M Object Oriented Software Engineering AB](https://appshunter.io/developer/498983792) | [Teo Udovcic](https://appshunter.io/developer/1611085313) |

## 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


### RayLimit

[App page](https://appshunter.io/ios/app/raylimit-sun-exposure-timer/id6759309534)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RayLimit Premium | $3.99 | per month |
| RayLimit Premium | $19.99 | per year |


## Frequently asked questions

### Is Ketonix free?

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

### Is RayLimit free?

RayLimit is free to download, with in-app purchases available.

### Do Ketonix or RayLimit have ads?

Neither Ketonix nor RayLimit shows ads.

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

Ketonix ships an update every 5 weeks, and RayLimit every 3 months. Most recently, Ketonix was updated on October 8, 2026 and RayLimit on October 9, 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.*