# RxMarbles vs Croc 24

The clearest difference is in-app purchases: RxMarbles at none against Croc 24's 1. RxMarbles also leads on ratings volume (16 vs 2) and iOS requirement (9.2 vs 17.0). Croc 24's advantage is update cadence (every 3 weeks vs every 4 months). On price, rating, ads and monetization model there is nothing between them.

Both are free to download. Croc 24 sells 1 one-off in-app purchase. 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 Croc 24. That said, the two scores are not equally well evidenced: RxMarbles has 16 ratings behind it against 2, so its average is the more settled of the two.

RxMarbles ships an update every 4 months, Croc 24 every 3 weeks. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | RxMarbles | Croc 24 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (16 ratings)](https://appshunter.io/ios/app/rxmarbles/id1087272442/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/croc-24-math-game/id6746104087/reviews)** |
| Number of ratings | **16** | 2 |
| Positive reviews | 84.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 21 MB | 23 MB |
| Requires iOS | **9.2** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [AnjLab](https://appshunter.io/developer/501327862) | [Wei Wang](https://appshunter.io/developer/1467609434) |

## 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


### Croc 24

[App page](https://appshunter.io/ios/app/croc-24-math-game/id6746104087)

This app offers a fun way to practice and master the 24 game. It features a free calculator for finding solutions, a challenge mode for testing skills, and a history tracker to monitor progress. Enjoy a delightful and ad-free mathematical adventure.

**Highlights:** Free calculator for finding all solutions, Challenge mode with random puzzles, History tracker for progress monitoring, Powerful mathematical algorithm, Adorable and intuitive interface, Ad-free gaming experience

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Premium | $1.99 | one-time |


## Frequently asked questions

### Is RxMarbles free?

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

### Is Croc 24 free?

Croc 24 is free to download, with in-app purchases available.

### Which has better reviews, RxMarbles or Croc 24?

Croc 24 is rated higher. RxMarbles averages 4.9 out of 5 from 16 ratings, while Croc 24 averages 5.0 from 2 ratings.

### Do RxMarbles or Croc 24 have ads?

Neither RxMarbles nor Croc 24 shows ads.

### Which is updated more often, RxMarbles or Croc 24?

RxMarbles ships an update every 4 months, and Croc 24 every 3 weeks. Most recently, RxMarbles was updated on October 24, 2026 and Croc 24 on October 16, 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.*