# RxMarbles vs iJun

The clearest difference is price: RxMarbles at Free against iJun's $1.99. RxMarbles also leads on iOS requirement (9.2 vs 14.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

RxMarbles is free to download; iJun costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RxMarbles ships an update every 4 months, iJun every 3 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | RxMarbles | iJun |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.9 (16 ratings)](https://appshunter.io/ios/app/rxmarbles/id1087272442/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 86.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 21 MB | 15 MB |
| Requires iOS | **9.2** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [AnjLab](https://appshunter.io/developer/501327862) | [Aleksey Krzhivitskiy](https://appshunter.io/developer/1613514160) |

## 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


### iJun

[App page](https://appshunter.io/ios/app/ijun/id1671447565)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RxMarbles free?

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

### Is iJun free?

iJun costs $1.99, with no in-app purchases.

### Do RxMarbles or iJun have ads?

Neither RxMarbles nor iJun shows ads.

### Which is updated more often, RxMarbles or iJun?

RxMarbles ships an update every 4 months, and iJun every 3 months. Most recently, RxMarbles was updated on November 2, 2026 and iJun on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*