# Chain vs Theraphysio

The clearest difference is iOS requirement: Chain at 12.0 against Theraphysio's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Chain ships an update every 9 months, Theraphysio every 7 months. The most recent releases landed on October 6, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Chain | Theraphysio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 7 months** |
| Size | 32 MB | 41 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [CHU de Liege](https://appshunter.io/developer/1454207793) | [Hexfit](https://appshunter.io/developer/1131462836) |

## What reviewers say

### Chain

[App page](https://appshunter.io/ios/app/chain/id6444040101)

**Features:** macOS Compatibility

**In-app purchases:** none


### Theraphysio

[App page](https://appshunter.io/ios/app/theraphysio/id6745491710)

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

**In-app purchases:** none


## Frequently asked questions

### Is Chain free?

Chain is free to download, with no in-app purchases.

### Is Theraphysio free?

Theraphysio is free to download, with no in-app purchases.

### Do Chain or Theraphysio have ads?

Neither Chain nor Theraphysio shows ads.

### Which is updated more often, Chain or Theraphysio?

Chain ships an update every 9 months, and Theraphysio every 7 months. Most recently, Chain was updated on October 6, 2026 and Theraphysio on October 11, 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.*