# III vs 元素

The clearest difference is price: 元素 at Free against III's $2.99. 元素 also leads on update cadence (every 4 months vs every 17 months). III's advantage is ads (none vs shown) and iOS requirement (11.0 vs 13.0). On in-app purchases and device support there is nothing between them.

元素 is free to download; III costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

III ships an update every 17 months, 元素 every 4 months. The most recent releases landed on October 2, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | III | 元素 |
| --- | --- | --- |
| 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 | No |
| Ads | **No** | Yes |
| Update frequency | Every 17 months | **Every 4 months** |
| Monetization | Paid | — |
| Size | 10 MB | 87 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Takuya Ishikawa](https://appshunter.io/developer/468311118) | [Ohmori Takeru](https://appshunter.io/developer/969791681) |

## 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


### 元素

[App page](https://appshunter.io/ios/app/id6476252583)

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

**In-app purchases:** none


## Frequently asked questions

### Is III free?

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

### Is 元素 free?

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

### Do III or 元素 have ads?

元素 shows ads; III does not.

### Which is updated more often, III or 元素?

III ships an update every 17 months, and 元素 every 4 months. Most recently, III was updated on October 2, 2026 and 元素 on October 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.*