# Knuckle vs SizeMyRing

Knuckle and SizeMyRing are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Knuckle sells 1 one-off in-app purchase and SizeMyRing sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Knuckle | SizeMyRing |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Size | 12 MB | 5 MB |
| Requires iOS | 26.0 | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Andrii Bashta](https://appshunter.io/developer/1547467775) | [EmeraldApps.io](https://appshunter.io/developer/1841972627) |

## What reviewers say

### Knuckle

[App page](https://appshunter.io/ios/app/knuckle-ring-sizer/id6780806994)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Knuckle Lifetime | $9.99 | one-time |


### SizeMyRing

[App page](https://appshunter.io/ios/app/sizemyring-ring-sizer/id6791215499)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $2.99 | per 7 days |
| Annual | $19.99 | per year |
| Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is Knuckle free?

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

### Is SizeMyRing free?

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

### Do Knuckle or SizeMyRing have ads?

Neither Knuckle nor SizeMyRing shows ads.

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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.*