# Trans4motor R vs Structura 元素合成 ― 化学反応を覚えるパズル

The clearest difference is price: Structura 元素合成 ― 化学反応を覚えるパズル at Free against Trans4motor R's $7.99. Structura 元素合成 ― 化学反応を覚えるパズル also leads on review sentiment (100% vs 64%). Trans4motor R's advantage is in-app purchases (none vs 1) and chart position (#170 vs unranked). On update cadence, ads, device support and iOS requirement there is nothing between them.

Structura 元素合成 ― 化学反応を覚えるパズル is free to download; Trans4motor R costs $7.99 up front. Structura 元素合成 ― 化学反応を覚えるパズル sells 1 one-off in-app purchase. Trans4motor R asks for nothing beyond the download.

Trans4motor R ships an update every 2 weeks, Structura 元素合成 ― 化学反応を覚えるパズル weekly. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Trans4motor R | Structura 元素合成 ― 化学反応を覚えるパズル |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[4.6 (11 ratings)](https://appshunter.io/ios/app/trans4motor-r/id6739180076/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 64.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#170** | — |
| Size | 178 MB | 99 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kitt Peak, Inc.](https://appshunter.io/developer/399507326) | [SNAPLACE LLC](https://appshunter.io/developer/6790258232) |

## What reviewers say

### Trans4motor R

[App page](https://appshunter.io/ios/app/trans4motor-r/id6739180076)

**Currently charting:** #170 Top Paid · Education (US App Store)

Explore and animate four-stroke engines with detailed customization options. Simulate transmissions, edit engine specifications, and experience realistic vehicle physics. Share your creations and learn about engine mechanics through interactive tutorials.

**Highlights:** Seamless engine morphing (inline to V, cylinder count, firing intervals), Full transmission visualization (3-shaft, 2-shaft, dog gearbox), Deep engine specification editing, Realistic vehicle physics simulation, Community sharing platform for engine designs, Interactive learning modes (TechTour), Enhanced, realistic engine sound simulation

**In-app purchases:** none


### Structura 元素合成 ― 化学反応を覚えるパズル

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

Learn chemical reactions through a falling puzzle game. Connect elements and ions to form compounds, with visual representations of structures and interactive quizzes to reinforce learning. Covers inorganic, organic, and polymer reactions.

**Highlights:** Falling puzzle gameplay, Visual representation of chemical structures, Interactive quizzes, Covers inorganic, organic, and polymer reactions, Progress tracking for forgotten reactions, Element characters with stage-specific tips

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 全単元を解放 | $2.99 | one-time |


## Frequently asked questions

### Is Trans4motor R free?

Trans4motor R costs $7.99, with no in-app purchases.

### Is Structura 元素合成 ― 化学反応を覚えるパズル free?

Structura 元素合成 ― 化学反応を覚えるパズル is free to download, with in-app purchases available.

### Do Trans4motor R or Structura 元素合成 ― 化学反応を覚えるパズル have ads?

Neither Trans4motor R nor Structura 元素合成 ― 化学反応を覚えるパズル shows ads.

### Which is updated more often, Trans4motor R or Structura 元素合成 ― 化学反応を覚えるパズル?

Trans4motor R ships an update every 2 weeks, and Structura 元素合成 ― 化学反応を覚えるパズル weekly. Most recently, Trans4motor R was updated on October 30, 2026 and Structura 元素合成 ― 化学反応を覚えるパズル on October 31, 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.*