# OS Interview Questions vs Code Directory

The clearest difference is in-app purchases: Code Directory at none against OS Interview Questions's 1. Code Directory also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 95 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. OS Interview Questions sells 1 one-off in-app purchase. Code Directory asks for nothing beyond the download.

OS Interview Questions ships an update every 95 months, Code Directory every 2 weeks. The most recent releases landed on September 28, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | OS Interview Questions | Code Directory |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/os-interview-questions/id1070986818/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 95 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 20 MB |
| Requires iOS | 14.0 | **13.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RAVINDHIRAN SUMITHRA](https://appshunter.io/developer/1571016391) | [Dzmitry Rybak](https://appshunter.io/developer/1754833234) |

## What reviewers say

### OS Interview Questions

[App page](https://appshunter.io/ios/app/os-interview-questions/id1070986818)

Learn fundamental operating system concepts and interview questions with this educational app. It offers a user-friendly interface to explore topics, save favorites, and customize your reading experience. Sharpen your technical knowledge for career advancement.

**Highlights:** Operating system overview, Functions of operating systems, Types of operating systems, Embedded OS interview questions, User-friendly interface, Personalized library for favorites, Customizable themes and fonts

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OS Interview Questions | $3.99 | one-time |


### Code Directory

[App page](https://appshunter.io/ios/app/code-directory/id6505036762)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OS Interview Questions free?

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

### Is Code Directory free?

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

### Do OS Interview Questions or Code Directory have ads?

OS Interview Questions shows ads; Code Directory does not.

### Which is updated more often, OS Interview Questions or Code Directory?

OS Interview Questions ships an update every 95 months, and Code Directory every 2 weeks. Most recently, OS Interview Questions was updated on September 28, 2026 and Code Directory on September 29, 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.*