# Ring Sizer vs DIAMETRO

The clearest difference is in-app purchases: DIAMETRO at none against Ring Sizer's 2. DIAMETRO also leads on update cadence (every 2 weeks vs every 3 months). Ring Sizer's advantage is iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Ring Sizer sells 2 in-app purchases, starting at $9.99 per 7 days. DIAMETRO asks for nothing beyond the download.

Ring Sizer ships an update every 3 months, DIAMETRO every 2 weeks. The most recent releases landed on October 31, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Ring Sizer | DIAMETRO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/ring-sizer-finger-measure/id6759689480/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Subscription | — |
| Size | 56 MB | 4 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Wotaso GmbH](https://appshunter.io/developer/1850131192) | [ALEXANDRU TEODOR TRANDAFIR](https://appshunter.io/developer/6810555118) |

## What reviewers say

### Ring Sizer

[App page](https://appshunter.io/ios/app/ring-sizer-finger-measure/id6759689480)

Easily determine your ring size using your finger or an existing ring. Supports various international sizing systems to help you avoid ordering the wrong size. Measurement results are recommendations and should be verified before purchase.

**Highlights:** Measure finger size, Measure existing ring size, Supports international sizing systems (EU, US, UK), Quick and simple to use, Reduces ordering wrong ring sizes

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ring Sizer Pro Weekly | $9.99 | per 7 days |
| Ring Sizer Pro Lifetime | $19.99 | one-time |


### DIAMETRO

[App page](https://appshunter.io/ios/app/diametro-ring-sizer/id6810555116)

**In-app purchases:** none


## Frequently asked questions

### Is Ring Sizer free?

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

### Is DIAMETRO free?

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

### Do Ring Sizer or DIAMETRO have ads?

Neither Ring Sizer nor DIAMETRO shows ads.

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

Ring Sizer ships an update every 3 months, and DIAMETRO every 2 weeks. Most recently, Ring Sizer was updated on October 31, 2026 and DIAMETRO on October 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.*