# RxMarbles vs Brevia

The clearest difference is in-app purchases: RxMarbles at none against Brevia's 3. RxMarbles also leads on iOS requirement (9.2 vs 18.0). Brevia's advantage is update cadence (weekly vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Brevia sells 3 one-off in-app purchases. RxMarbles asks for nothing beyond the download.

RxMarbles ships an update every 4 months, Brevia weekly. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | RxMarbles | Brevia |
| --- | --- | --- |
| Price | Free | Free |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | Free | — |
| Size | 21 MB | 3 MB |
| Requires iOS | **9.2** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [AnjLab](https://appshunter.io/developer/501327862) | [Saksham Virmani](https://appshunter.io/developer/1896714617) |

## 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


### Brevia

[App page](https://appshunter.io/ios/app/brevia-learn-dsa/id6775131083)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small tip | $1.99 | one-time |
| Supporter tip | $4.99 | one-time |
| Hero tip | $9.99 | one-time |


## Frequently asked questions

### Is RxMarbles free?

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

### Is Brevia free?

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

### Do RxMarbles or Brevia have ads?

Neither RxMarbles nor Brevia shows ads.

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

RxMarbles ships an update every 4 months, and Brevia weekly. Most recently, RxMarbles was updated on November 2, 2026 and Brevia on November 5, 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.*