# Retain Mobile App vs Structural Chiropractic

The clearest difference is update cadence: Structural Chiropractic at every 3 weeks against Retain Mobile App's every 6 months. On price, ads, in-app purchases and device support there is nothing between them.

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

Retain Mobile App ships an update every 6 months, Structural Chiropractic every 3 weeks. The most recent releases landed on October 6, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Retain Mobile App | Structural Chiropractic |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Size | 22 MB | 110 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Retain International LTD](https://appshunter.io/developer/978084277) | [Structural Chiropractic Limited](https://appshunter.io/developer/1765103442) |

## What reviewers say

### Retain Mobile App

[App page](https://appshunter.io/ios/app/retain-mobile-app/id1594380148)

**Features:** macOS Compatibility

**In-app purchases:** none


### Structural Chiropractic

[App page](https://appshunter.io/ios/app/structural-chiropractic/id6670165833)

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

**In-app purchases:** none


## Frequently asked questions

### Is Retain Mobile App free?

Retain Mobile App is free to download, with no in-app purchases.

### Is Structural Chiropractic free?

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

### Do Retain Mobile App or Structural Chiropractic have ads?

Neither Retain Mobile App nor Structural Chiropractic shows ads.

### Which is updated more often, Retain Mobile App or Structural Chiropractic?

Retain Mobile App ships an update every 6 months, and Structural Chiropractic every 3 weeks. Most recently, Retain Mobile App was updated on October 6, 2026 and Structural Chiropractic on October 14, 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.*