# Interview Master vs Professional Data Engineer

The clearest difference is update cadence: Interview Master at fortnightly against Professional Data Engineer's every 13 months. Professional Data Engineer's advantage is iOS requirement (10.0 vs 12.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Interview Master sells 1 in-app purchase, starting at $3.99 per month and Professional Data Engineer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Interview Master ships an update fortnightly, Professional Data Engineer every 13 months. The most recent releases landed on June 9, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Interview Master | Professional Data Engineer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (8 ratings)](https://appshunter.io/ios/app/interview-master-data-science/id6472814256/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 87.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 13 months |
| Monetization | Free with in-app purchases | — |
| Size | 36 MB | 25 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Wowso Inc.](https://appshunter.io/developer/1385658786) | [Trieu Tran](https://appshunter.io/developer/1668827865) |

## What reviewers say

### Interview Master

[App page](https://appshunter.io/ios/app/interview-master-data-science/id6472814256)

Practice data science interviews with AI-powered simulations and daily quizzes. Receive instant feedback on your answers and track your progress to build confidence and deepen your understanding of complex topics.

**Highlights:** Real-time AI interview simulations, AI-evaluated daily quizzes, Instant feedback on answers, Progress tracking, Detailed question explanations, Community sharing features

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| IM: Data Science | $3.99 | per month |


### Professional Data Engineer

[App page](https://appshunter.io/ios/app/professional-data-engineer/id6473723698)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock complete App | $9.99 | one-time |


## Frequently asked questions

### Is Interview Master free?

Interview Master is free to download, with in-app purchases available.

### Is Professional Data Engineer free?

Professional Data Engineer is free to download, with in-app purchases available.

### Do Interview Master or Professional Data Engineer have ads?

Neither Interview Master nor Professional Data Engineer shows ads.

### Which is updated more often, Interview Master or Professional Data Engineer?

Interview Master ships an update fortnightly, and Professional Data Engineer every 13 months. Most recently, Interview Master was updated on June 9, 2026 and Professional Data Engineer on September 21, 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.*