# Posture Fix using Head Motion vs Shelby

The clearest difference is iOS requirement: Shelby at 13.0 against Posture Fix using Head Motion's 17.6. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Posture Fix using Head Motion sells 2 in-app purchases, starting at $2.99 per 7 days and Shelby sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Posture Fix using Head Motion | Shelby |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Weekly |
| Size | 15 MB | 93 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ahmet Giray Ucar](https://appshunter.io/developer/1583246836) | [Nguyen Manh](https://appshunter.io/developer/1500937406) |

## What reviewers say

### Posture Fix using Head Motion

[App page](https://appshunter.io/ios/app/posture-fix-using-head-motion/id6781326644)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Podure Premium Weekly | $2.99 | per 7 days |
| Podure Premium Yearly | $24.99 | per year |


### Shelby

[App page](https://appshunter.io/ios/app/shelby-neck-exercise/id6785951753)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $9.99 | per month |
| Yearly Pro | $34.99 | per year |


## Frequently asked questions

### Is Posture Fix using Head Motion free?

Posture Fix using Head Motion is free to download, with in-app purchases available.

### Is Shelby free?

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

### Do Posture Fix using Head Motion or Shelby have ads?

Neither Posture Fix using Head Motion nor Shelby 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.*