# III vs Fasttrack ATPL

The clearest difference is review sentiment: III at 100% against Fasttrack ATPL's 33%. III also leads on rating (4.0 vs 3.0) and in-app purchases (none vs 10). Fasttrack ATPL's advantage is price (Free vs $2.99) and update cadence (every 2 months vs every 17 months). On ads and device support there is nothing between them.

Fasttrack ATPL is free to download; III costs $2.99 up front. Fasttrack ATPL sells 10 one-off in-app purchases. III asks for nothing beyond the download.

III holds the better App Store score, 4.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews point the same way: 100% of III's written reviews are positive against 33% of Fasttrack ATPL's.

III ships an update every 17 months, Fasttrack ATPL every 2 months. The most recent releases landed on November 6, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | III | Fasttrack ATPL |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/iii-v-comp/id475184953/reviews)** | [3.0 (3 ratings)](https://appshunter.io/ios/app/fasttrack-atpl-pilot-exams/id1198616341/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | **100.0% of reviews** | 33.3% 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 | 31 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Takuya Ishikawa](https://appshunter.io/developer/468311118) | [Logikwerk GmbH](https://appshunter.io/developer/813825633) |

## 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


### Fasttrack ATPL

[App page](https://appshunter.io/ios/app/fasttrack-atpl-pilot-exams/id1198616341)

Prepare for pilot theory exams with a comprehensive question bank covering EASA, Middle East, and Chinese ATPL syllabi. Includes specialized modules for specific airlines and aircraft typeratings.

**Highlights:** EASA ATPL theory exam preparation, Middle East (GCAA) and Chinese (CAAC) ATPL question banks, Aircraft typerating preparation (Boeing, Airbus, Embraer), Airline-specific ATPL assessment questions (Wizz Air, Qatar Airways), Detailed explanations for General Navigation questions, Refresher questionnaires for airlines

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 15 Weeks of FULL ATPL Package | $17.99 | one-time |
| 9 Weeks Qatar Airways ATPL | $22.99 | one-time |
| 9 Weeks Wizz Air ATPL | $22.99 | one-time |
| 500 Need to Know Assessment Q. | $22.99 | one-time |
| A320 Type Rating Question Bank | $26.99 | one-time |
| 12 Weeks of Chinese CAAC ATPL | $35.99 | one-time |
| 5 Weeks GCAA Subscription | $44.99 | one-time |
| 7 Weeks GCAA Subscription | $54.99 | one-time |
| 7 Weeks GCAA + 777 Type Rating | $74.99 | one-time |
| 9 Weeks GCAA Subscription | $99.99 | one-time |


## Frequently asked questions

### Is III free?

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

### Is Fasttrack ATPL free?

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

### Which has better reviews, III or Fasttrack ATPL?

III is rated higher. III averages 4.0 out of 5 from 1 ratings, while Fasttrack ATPL averages 3.0 from 3 ratings.

### Do III or Fasttrack ATPL have ads?

Neither III nor Fasttrack ATPL shows ads.

### Which is updated more often, III or Fasttrack ATPL?

III ships an update every 17 months, and Fasttrack ATPL every 2 months. Most recently, III was updated on November 6, 2026 and Fasttrack ATPL on November 9, 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.*