# 無機化学 vs Structura

The clearest difference is update cadence: Structura at every 4 days against 無機化学's every 2 months. Structura also leads on review sentiment (100% vs 86%) and iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. 無機化学 sells 3 in-app purchases, starting at $1.99 per month and Structura sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

無機化学 ships an update every 2 months, Structura every 4 days. Both last shipped on November 8, 2026.

## The numbers

| Metric | 無機化学 | Structura |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 86.4% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | Freemium | Freemium |
| Size | 8 MB | 100 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Akihiko Kitamura](https://appshunter.io/developer/1585792497) | [SNAPLACE](https://appshunter.io/developer/6790258232) |

## What reviewers say

### 無機化学

[App page](https://appshunter.io/ios/app/id6737172145)

This app helps high school students memorize inorganic chemistry concepts. It covers reaction principles, metallic elements, and non-metallic elements, utilizing a red-sheet overlay for easy output and review. User feedback is actively incorporated for improvements.

**Highlights:** Red sheet overlay for output practice, Comprehensive inorganic chemistry content, Covers reaction principles, Covers metallic elements, Covers non-metallic elements, User feedback integration

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro - 1ヶ月 | $1.99 | per month |
| Pro - 6ヶ月 | $11.99 | per 6 months |
| Pro - 12ヶ月 | $19.99 | per year |


### Structura

[App page](https://appshunter.io/ios/app/structura-element-synthesis/id6795030898)

Learn chemical reactions by playing a falling-block puzzle game. Combine elements and ions to build compounds, with over 350 reactions covered. Practice recall with quizzes and tests, and experiment freely with all elements.

**Highlights:** Falling-block puzzle gameplay, Element and ion combination, 356 chemical reactions covered, 46 learning stages, In-game quizzes and tests, Free experiment mode, Visual representation of compounds

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Units | $2.99 | one-time |


## Frequently asked questions

### Is 無機化学 free?

無機化学 is free to download, with in-app purchases available.

### Is Structura free?

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

### Do 無機化学 or Structura have ads?

Neither 無機化学 nor Structura shows ads.

### Which is updated more often, 無機化学 or Structura?

無機化学 ships an update every 2 months, and Structura every 4 days. Most recently, 無機化学 was updated on November 8, 2026 and Structura on November 8, 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.*