# Dornheim 3D Scanner vs Ring Sizer

The clearest difference is update cadence: Ring Sizer at weekly against Dornheim 3D Scanner's every 17 months. Dornheim 3D Scanner's advantage is iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Dornheim 3D Scanner sells 7 in-app purchases, starting at $9.99 per month and Ring Sizer sells 13 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Dornheim 3D Scanner ships an update every 17 months, Ring Sizer weekly. The most recent releases landed on September 17, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Dornheim 3D Scanner | Ring Sizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (36 ratings)](https://appshunter.io/ios/app/ring-sizer-risi/id6736565382/reviews)** |
| Number of ratings | — | **36** |
| Positive reviews | — | 88.2% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 17 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 11 MB | 19 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dornheim Medical Images GmbH](https://appshunter.io/developer/1450370278) | [Axel Le Pennec](https://appshunter.io/developer/671697425) |

## What reviewers say

### Dornheim 3D Scanner

[App page](https://appshunter.io/ios/app/dornheim-3d-scanner/id1505306338)

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $9.99 | per month |
| Export function - Monthly | $4.99 | one-time |
| Measurement - Monthly | $9.99 | one-time |
| Export function - Yearly | $39.99 | one-time |
| Measurement - Yearly | $79.99 | one-time |
| Export function - Perpetual | $99.99 | one-time |
| Measurement - Perpetual | $199.99 | one-time |


### Ring Sizer

[App page](https://appshunter.io/ios/app/ring-sizer-risi/id6736565382)

Accurately measure ring and finger sizes from home, ensuring a perfect fit for any occasion. Convert sizes internationally and save measurements for future use. Ideal for online ring purchases, eliminating guesswork.

**Highlights:** Measure ring diameter/circumference, Measure finger width, International size conversions, Save measurements, Share measurements

**In-app purchases (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Weekly | $4.99 | per 7 days |
| Weekly | $5.99 | per 7 days |
| Weekly | $6.99 | per 7 days |
| Weekly | $6.99 | per 7 days |
| Weekly | $7.99 | per 7 days |
| Yearly | $17.99 | per year |
| Yearly | $24.99 | per year |
| Lifetime | $2.99 | one-time |
| Lifetime | $4.99 | one-time |
| Lifetime | $6.99 | one-time |
| Lifetime | $19.99 | one-time |
| Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is Dornheim 3D Scanner free?

Dornheim 3D Scanner is free to download, with in-app purchases available.

### Is Ring Sizer free?

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

### Do Dornheim 3D Scanner or Ring Sizer have ads?

Neither Dornheim 3D Scanner nor Ring Sizer shows ads.

### Which is updated more often, Dornheim 3D Scanner or Ring Sizer?

Dornheim 3D Scanner ships an update every 17 months, and Ring Sizer weekly. Most recently, Dornheim 3D Scanner was updated on September 17, 2026 and Ring Sizer on September 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.*