# Chain vs ABAK Physio Tests

The clearest difference is in-app purchases: Chain at none against ABAK Physio Tests's 2. Chain also leads on iOS requirement (12.0 vs 15.0). ABAK Physio Tests's advantage is update cadence (monthly vs every 9 months). On price, ads and device support there is nothing between them.

Both are free to download. ABAK Physio Tests sells 2 in-app purchases, starting at $0.99 per month. Chain asks for nothing beyond the download.

Chain ships an update every 9 months, ABAK Physio Tests monthly. The most recent releases landed on September 19, 2026 and August 18, 2026 respectively.

## The numbers

| Metric | Chain | ABAK Physio Tests |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Monthly** |
| Size | 32 MB | 51 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [CHU de Liege](https://appshunter.io/developer/1454207793) | [Abak Metrics](https://appshunter.io/developer/1839743627) |

## What reviewers say

### Chain

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

**Features:** macOS Compatibility

**In-app purchases:** none


### ABAK Physio Tests

[App page](https://appshunter.io/ios/app/abak-physio-tests/id6752613675)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Abak Premium - Monthly subscription | $0.99 | per month |
| Abak Premium - Annuel | $8.99 | per year |


## Frequently asked questions

### Is Chain free?

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

### Is ABAK Physio Tests free?

ABAK Physio Tests is free to download, with in-app purchases available.

### Do Chain or ABAK Physio Tests have ads?

Neither Chain nor ABAK Physio Tests shows ads.

### Which is updated more often, Chain or ABAK Physio Tests?

Chain ships an update every 9 months, and ABAK Physio Tests monthly. Most recently, Chain was updated on September 19, 2026 and ABAK Physio Tests on August 18, 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.*