# 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). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Ring Sizer sells 2 in-app purchases, starting at $3.99 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 11, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Ring Sizer | DIAMETRO |
| --- | --- | --- |
| 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Freemium | — |
| Size | 14 MB | 4 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [GUNAYDIN APP STUDIO](https://appshunter.io/developer/1888018712) | [ALEXANDRU TEODOR TRANDAFIR](https://appshunter.io/developer/6810555118) |

## What reviewers say

### 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 |


### 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 11, 2026 and DIAMETRO on October 21, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*