# Digital Fortress vs Kotlin Programming

The clearest difference is in-app purchases: Digital Fortress at none against Kotlin Programming's 1. Digital Fortress also leads on iOS requirement (12.0 vs 17.2). On price, ads and device support there is nothing between them.

Both are free to download. Kotlin Programming sells 1 one-off in-app purchase. Digital Fortress asks for nothing beyond the download.

## The numbers

| Metric | Digital Fortress | Kotlin Programming |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/kotlin-programming/id6544798982/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 2 months |
| Monetization | — | Free |
| Size | 65 MB | 61 MB |
| Requires iOS | **12.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [YAHYA SAYED OMAR](https://appshunter.io/developer/1730674604) | [Akshay Bhasme](https://appshunter.io/developer/1757403977) |

## What reviewers say

### Digital Fortress

[App page](https://appshunter.io/ios/app/digital-fortress/id6477818828)

**Features:** macOS Compatibility

**In-app purchases:** none


### Kotlin Programming

[App page](https://appshunter.io/ios/app/kotlin-programming/id6544798982)

Learn Kotlin programming through interactive practice programs and a built-in code editor. Covers basics, OOP, functional programming, and Android development essentials. Includes a quiz game to test knowledge and track progress.

**Highlights:** 500+ interactive practice programs, Built-in code editor with real-time output, Learn Kotlin basics to advanced, Object-Oriented and Functional Programming modules, Android Development Essentials, Quiz game for knowledge testing, Offline access

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is Digital Fortress free?

Digital Fortress is free to download, with no in-app purchases.

### Is Kotlin Programming free?

Kotlin Programming is free to download, with in-app purchases available.

### Do Digital Fortress or Kotlin Programming have ads?

Neither Digital Fortress nor Kotlin Programming shows ads.

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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.*