# III vs IELTS Practice | Test

The clearest difference is review sentiment: III at 100% against IELTS Practice | Test's 50%. III also leads on in-app purchases (none vs 5) and iOS requirement (11.0 vs 15.0). IELTS Practice | Test's advantage is price (Free vs $2.99) and rating (5.0 vs 4.0). On ads and device support there is nothing between them.

IELTS Practice | Test is free to download; III costs $2.99 up front. IELTS Practice | Test sells 5 in-app purchases, starting at $29.99 per month. III asks for nothing beyond the download.

IELTS Practice | Test holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews complicate that: 100% of III's written reviews are positive against 50% of IELTS Practice | Test's, so the app with the better star average is not the one people write more warmly about.

III ships an update every 17 months, IELTS Practice | Test every 2 months. The most recent releases landed on October 2, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | III | IELTS Practice | Test |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/iii-v-comp/id475184953/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/ielts-practice-test/id6526463103/reviews)** |
| Number of ratings | 1 | **3** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 2 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 10 MB | 51 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Takuya Ishikawa](https://appshunter.io/developer/468311118) | [志桂 李](https://appshunter.io/developer/1686507153) |

## 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


### IELTS Practice | Test

[App page](https://appshunter.io/ios/app/ielts-practice-test/id6526463103)

Prepare for the IELTS exam with a comprehensive learning app. It offers practice for listening, speaking, reading, and writing, along with reading materials and essay correction services. Advanced speech recognition provides real-time feedback on pronunciation and fluency.

**Highlights:** IELTS listening, speaking, reading, writing practice, Detailed explanations and tips, Extensive English reading materials, Speaking practice with real-time scoring, Professional essay correction services, Speech recognition for pronunciation feedback

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP | $29.99 | per month |
| VIP | $49.99 | per 3 months |
| VIP | $99.99 | per year |
| Lecture IELTS 6 points | $99.99 | one-time |
| Écriture IELTS 6 points | $99.99 | one-time |


## Frequently asked questions

### Is III free?

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

### Is IELTS Practice | Test free?

IELTS Practice | Test is free to download, with in-app purchases available.

### Which has better reviews, III or IELTS Practice | Test?

IELTS Practice | Test is rated higher. III averages 4.0 out of 5 from 1 ratings, while IELTS Practice | Test averages 5.0 from 3 ratings.

### Do III or IELTS Practice | Test have ads?

Neither III nor IELTS Practice | Test shows ads.

### Which is updated more often, III or IELTS Practice | Test?

III ships an update every 17 months, and IELTS Practice | Test every 2 months. Most recently, III was updated on October 2, 2026 and IELTS Practice | Test on October 1, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*