RxMarbles vs Croc 24
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RxMarbles
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.
- Interactive observable diagrams
- Visualization of event streams
- Demonstration of composition operators
- Educational tool for asynchronous programming
- Explains observer pattern extensions
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Interactive diagrams of Rx Observables. ReactiveX is a library for composing asynchronous and event-based programs by using observable sequences. It extends the observer pattern to support sequences of data and/or events and adds operators that allow you to compose sequences together declaratively while abstracting away concerns about things like low-level threading, synchronization, thread-safety, concurrent data structures, and non-blocking I/O.
Croc 24
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.
- 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
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Welcome to Croc's 24-Point Kingdom! Remember those fun times playing the 24 game with friends? Now our adorable croc buddy brings back that pure joy of mathematical discovery! Three Amazing Game Modes: • Free Calculator: Enter any 4 numbers and Croc instantly finds ALL possible solutions to make 24! No more head-scratching moments~ • Challenge Mode: Random 24-point puzzles test your math skills. Every question is a new challenge! • History Tracker: Review your calculation journey and witness your evolution from 24-game rookie to math champion! Why Choose Croc 24? • Powerful Algorithm: Advanced mathematical engine ensures every possible solution is found • Adorable Interface: Cute croc expressions make boring math absolutely delightful • Simple Operation: Intuitive touch interface suitable for all ages • Completely Free: No ads, pure gaming experience More than just a game: • Perfect math thinking trainer • Mental calculation skill booster • Fun family bonding tool • Your best companion for leisure time Join Croc on this amazing 24-point adventure! Let's make math fun and calculation joyful! Download now and start your 24-point quest!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | RxMarbles | Croc 24 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (16 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 84.0% of reviews | — |
| Number of ratings | 16 — better | 2 |
| Update frequency | Every 4 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 9.2 — better | 17.0 |
| Further details — not scored | ||
| Size | 21 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | AnjLab | Wei Wang |
Customer experience
RxMarbles
Croc 24
In-app purchases
RxMarbles
No in-app purchases
Croc 24
- Unlock Premium$1.99
