# Learn Data Structures vs Interview Master

The clearest difference is update cadence: Interview Master at fortnightly against Learn Data Structures's every 16 months. Interview Master also leads on iOS requirement (12.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

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

Learn Data Structures ships an update every 16 months, Interview Master fortnightly. The most recent releases landed on September 26, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Learn Data Structures | Interview Master |
| --- | --- | --- |
| 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 | Every 16 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 28 MB | 36 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ghumman Tech LLC](https://appshunter.io/developer/1671347750) | [Wowso Inc.](https://appshunter.io/developer/1385658786) |

## What reviewers say

### Learn Data Structures

[App page](https://appshunter.io/ios/app/learn-data-structures/id6446444404)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $9.99 | one-time |


### 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 |


## Frequently asked questions

### Is Learn Data Structures free?

Learn Data Structures is free to download, with in-app purchases available.

### Is Interview Master free?

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

### Do Learn Data Structures or Interview Master have ads?

Neither Learn Data Structures nor Interview Master shows ads.

### Which is updated more often, Learn Data Structures or Interview Master?

Learn Data Structures ships an update every 16 months, and Interview Master fortnightly. Most recently, Learn Data Structures was updated on September 26, 2026 and Interview Master on September 16, 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.*