# Caloryx vs Ring Sizer

The clearest difference is in-app purchases: Caloryx at none against Ring Sizer's 2. Ring Sizer's advantage is iOS requirement (18.0 vs 27.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Ring Sizer sells 2 in-app purchases, starting at $3.99 per 7 days. Caloryx asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on September 30, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Caloryx | Ring Sizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ring-sizer-finger-measure-app/id6761365066/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | — | Freemium |
| Size | 2 MB | 14 MB |
| Requires iOS | 27.0 | **18.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Calvin Fraites](https://appshunter.io/developer/1802751239) | [GUNAYDIN APP STUDIO](https://appshunter.io/developer/1888018712) |

## What reviewers say

### Caloryx

[App page](https://appshunter.io/ios/app/caloryx/id6757248997)

**Features:** Vision Pro support

**In-app purchases:** none


### Ring Sizer

[App page](https://appshunter.io/ios/app/ring-sizer-finger-measure-app/id6761365066)

Easily determine your perfect ring size from home using your phone's screen or camera. Get accurate measurements in seconds and convert between international sizing standards.

**Highlights:** Measure finger size on screen, Measure existing ring size on screen, Accurate camera measurement, International ring size conversion, Works offline, Easy to use interface

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| premium | $3.99 | per 7 days |
| premium | $29.99 | per year |


## Frequently asked questions

### Is Caloryx free?

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

### Is Ring Sizer free?

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

### Do Caloryx or Ring Sizer have ads?

Neither Caloryx nor Ring Sizer shows ads.

### Which is updated more often, Caloryx or Ring Sizer?

Caloryx ships an update every 3 months, and Ring Sizer every 3 months. Most recently, Caloryx was updated on September 30, 2026 and Ring Sizer on October 11, 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.*