# Ring Sizer vs Prelude AI

The clearest difference is ads: Prelude AI at none against Ring Sizer's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Ring Sizer sells 8 in-app purchases, starting at $1.99 per 7 days and Prelude AI sells 3 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Ring Sizer ships an update every 3 weeks, Prelude AI fortnightly. The most recent releases landed on October 12, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Ring Sizer | Prelude AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ring-sizer-ring-size-measure/id6744610350/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 44 MB | 66 MB |
| Requires iOS | 16 | **15.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [VAN LY PHUC](https://appshunter.io/developer/1807965394) | [DADESIGN INTERNATIONAL LIMITED](https://appshunter.io/developer/6774600031) |

## What reviewers say

### Ring Sizer

[App page](https://appshunter.io/ios/app/ring-sizer-ring-size-measure/id6744610350)

Easily measure your ring size or your finger's circumference using your iPhone. Get accurate results in seconds with 2D and 3D measurement options. Supports global size standards for convenient shopping.

**Highlights:** Accurate 2D & 3D ring sizing, Direct finger measurement, Worldwide size converter, Intuitive on-screen guides, Save multiple measurements

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Trial | $1.99 | per 7 days |
| Weekly Premium | $1.99 | per 7 days |
| Monthly Premium | $2.99 | per month |
| Yearly Premium | $19.99 | per year |
| Weekly Premium | $3.99 | one-time |
| Monthly Premium | $4.99 | one-time |
| Lifetime | $7.99 | one-time |
| Yearly Premium | $19.99 | one-time |


### Prelude AI

[App page](https://appshunter.io/ios/app/prelude-ai/id6774600029)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Prelude Premium Weekly | $9.99 | per 7 days |
| Prelude Premium Monthly | $19.99 | per month |
| Prelude Premium Quarterly | $49.99 | per 3 months |


## Frequently asked questions

### Is Ring Sizer free?

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

### Is Prelude AI free?

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

### Do Ring Sizer or Prelude AI have ads?

Ring Sizer shows ads; Prelude AI does not.

### Which is updated more often, Ring Sizer or Prelude AI?

Ring Sizer ships an update every 3 weeks, and Prelude AI fortnightly. Most recently, Ring Sizer was updated on October 12, 2026 and Prelude AI on October 25, 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.*