# III vs 高中化学

The clearest difference is price: 高中化学 at Free against III's $2.99. 高中化学 also leads on update cadence (every 5 months vs every 17 months). III's advantage is in-app purchases (none vs 5) and iOS requirement (11.0 vs 13.0). On ads and device support there is nothing between them.

高中化学 is free to download; III costs $2.99 up front. 高中化学 sells 5 one-off in-app purchases. III asks for nothing beyond the download.

III ships an update every 17 months, 高中化学 every 5 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | III | 高中化学 |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/iii-v-comp/id475184953/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 5 months** |
| Monetization | Paid | — |
| Size | 10 MB | 168 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Takuya Ishikawa](https://appshunter.io/developer/468311118) | [GUANGZHOU XIANGQI CO.,LTD.](https://appshunter.io/developer/1264538341) |

## What reviewers say

### III

[App page](https://appshunter.io/ios/app/iii-v-comp/id475184953)

Calculate material properties for III-V compound semiconductors like AlGaInAsP. It determines compositions, lattice constant, strain, bandgap, and effective masses for InP or GaAs substrates.

**Highlights:** III-V compound semiconductor calculations, Material property determination, Composition calculation (x, y, z), Lattice constant and strain analysis, Bandgap and effective mass calculation, Supports InP and GaAs substrates

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

**In-app purchases:** none


### 高中化学

[App page](https://appshunter.io/ios/app/id1521614815)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 100能量球 | $0.99 | one-time |
| 300能量球 | $1.99 | one-time |
| 化学单科会员 | $1.99 | one-time |
| 500能量球 | $2.99 | one-time |
| 全科会员 | $4.99 | one-time |


## Frequently asked questions

### Is III free?

III costs $2.99, with no in-app purchases.

### Is 高中化学 free?

高中化学 is free to download, with in-app purchases available.

### Do III or 高中化学 have ads?

Neither III nor 高中化学 shows ads.

### Which is updated more often, III or 高中化学?

III ships an update every 17 months, and 高中化学 every 5 months. Most recently, III was updated on November 6, 2026 and 高中化学 on November 3, 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.*