# Knuckle vs True Ring Size

The clearest difference is in-app purchases: True Ring Size at none against Knuckle's 1. True Ring Size also leads on iOS requirement (13.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Knuckle sells 1 one-off in-app purchase. True Ring Size asks for nothing beyond the download.

## The numbers

| Metric | Knuckle | True Ring Size |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Size | 12 MB | 31 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andrii Bashta](https://appshunter.io/developer/1547467775) | [lapnito.cz s.r.o.](https://appshunter.io/developer/1577358577) |

## 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 |


### True Ring Size

[App page](https://appshunter.io/ios/app/true-ring-size-sizer-and-gauge/id6792821792)

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

**In-app purchases:** none


## Frequently asked questions

### Is Knuckle free?

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

### Is True Ring Size free?

True Ring Size is free to download, with no in-app purchases.

### Do Knuckle or True Ring Size have ads?

Neither Knuckle nor True Ring Size 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.*