# 하이드아웃 vs Structural Formulas Study

The clearest difference is update cadence: Structural Formulas Study at every 5 weeks against 하이드아웃's every 7 months. 하이드아웃's advantage is iOS requirement (12.0 vs 18.4). 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.

하이드아웃 ships an update every 7 months, Structural Formulas Study every 5 weeks. The most recent releases landed on July 6, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | 하이드아웃 | Structural Formulas Study |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 5 weeks** |
| Size | 38 MB | 5 MB |
| Requires iOS | **12.0** | 18.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Cobosys Inc.](https://appshunter.io/developer/1480524814) | [Jun Yamabe](https://appshunter.io/developer/1732682049) |

## What reviewers say

### 하이드아웃

[App page](https://appshunter.io/ios/app/id1481670735)

**Features:** macOS Compatibility

**In-app purchases:** none


### Structural Formulas Study

[App page](https://appshunter.io/ios/app/structural-formulas-study/id6752260162)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 하이드아웃 free?

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

### Is Structural Formulas Study free?

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

### Do 하이드아웃 or Structural Formulas Study have ads?

Neither 하이드아웃 nor Structural Formulas Study shows ads.

### Which is updated more often, 하이드아웃 or Structural Formulas Study?

하이드아웃 ships an update every 7 months, and Structural Formulas Study every 5 weeks. Most recently, 하이드아웃 was updated on July 6, 2026 and Structural Formulas Study on September 20, 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.*