# RxMarbles vs Swift is Fun

The clearest difference is in-app purchases: RxMarbles at none against Swift is Fun's 2. RxMarbles also leads on ratings volume (16 vs 1) and iOS requirement (9.2 vs 17.6). Swift is Fun's advantage is update cadence (every 2 weeks vs every 4 months). On price, rating, ads and device support there is nothing between them.

Both are free to download. Swift is Fun sells 2 in-app purchases, starting at $9.99 per month. RxMarbles asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for RxMarbles against 5.0 for Swift is Fun. That said, the two scores are not equally well evidenced: RxMarbles has 16 ratings behind it against 1, so its average is the more settled of the two.

RxMarbles ships an update every 4 months, Swift is Fun every 2 weeks. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | RxMarbles | Swift is Fun |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (16 ratings)](https://appshunter.io/ios/app/rxmarbles/id1087272442/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/swift-is-fun/id6776033050/reviews)** |
| Number of ratings | **16** | 1 |
| Positive reviews | 84.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 21 MB | 64 MB |
| Requires iOS | **9.2** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [AnjLab](https://appshunter.io/developer/501327862) | [Evgeniia Bruiko](https://appshunter.io/developer/6776033053) |

## What reviewers say

### RxMarbles

[App page](https://appshunter.io/ios/app/rxmarbles/id1087272442)

Visualize and understand ReactiveX observable sequences with interactive diagrams. This educational tool helps developers grasp complex asynchronous programming concepts by illustrating event-based data streams and composition operators.

**Highlights:** Interactive observable diagrams, Visualization of event streams, Demonstration of composition operators, Educational tool for asynchronous programming, Explains observer pattern extensions

**Features:** macOS Compatibility

**In-app purchases:** none


### Swift is Fun

[App page](https://appshunter.io/ios/app/swift-is-fun/id6776033050)

Learn Swift programming with interactive lessons, quizzes, and coding challenges. This app gamifies the learning process, allowing users to progress through content, solve problems, and track achievements as they build iOS development skills.

**Highlights:** Interactive Swift lessons, Coding exercises with instant feedback, Quizzes to reinforce concepts, Real code challenges, Progress tracking and achievements, Gamified learning experience

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $9.99 | per month |
| Yearly Premium | $79.99 | per year |


## Frequently asked questions

### Is RxMarbles free?

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

### Is Swift is Fun free?

Swift is Fun is free to download, with in-app purchases available.

### Which has better reviews, RxMarbles or Swift is Fun?

Swift is Fun is rated higher. RxMarbles averages 4.9 out of 5 from 16 ratings, while Swift is Fun averages 5.0 from 1 ratings.

### Do RxMarbles or Swift is Fun have ads?

Neither RxMarbles nor Swift is Fun shows ads.

### Which is updated more often, RxMarbles or Swift is Fun?

RxMarbles ships an update every 4 months, and Swift is Fun every 2 weeks. Most recently, RxMarbles was updated on October 24, 2026 and Swift is Fun on October 22, 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.*