RxMarbles vs Kanji Trainer
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.
Kanji Trainer
Master Japanese kanji with mnemonic phrases derived from etymological backgrounds. This app offers targeted repetition, detailed statistics, and training modes for reading, writing, and radicals. Learn 2136 Joyo-Kanji and 500 radicals effectively.
- Mnemonic phrases based on etymology
- Reading and writing practice
- Targeted repetition of unlearned characters
- Detailed learning statistics
- 2136 Joyo-Kanji included
- Radical training modes
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The strength of the Kanji Trainer are the mnemonic phrases for memorizing the character that are principally based on the etymological background. The components (radicals) are always used with the same consistent meaning. The phrases are constituted in the order that first the components are mentioned and at the end the meaning of that kanji. The main functions are: - Training of reading and writing the kanji characters - Mnemonic phrases for each character - Targeted repetition of unlearned characters - Detailed statistic diagrams of your learning success - 2136 Joyo-Kanji - 500 radicals as recurring elements that can be selected for learning the differences and simularities - Training modes for radical training Terms and conditions: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: RxMarbles at none against Kanji Trainer's 1. RxMarbles also leads on ratings volume (16 vs 2) and iOS requirement (9.2 vs 13.0). On price, rating, update cadence and ads 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. Kanji Trainer sells 1 in-app purchase, starting at $9.99 per year. 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 Kanji Trainer. 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, Kanji Trainer every 3 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | RxMarbles | Kanji Trainer |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (16 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 86.2% of reviews | — |
| Number of ratings | 16 — better | 2 |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 9.2 — better | 13.0 |
| Further details — not scored | ||
| Size | 21 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | AnjLab | Ulrich Neymeyr |
Customer experience
RxMarbles
Kanji Trainer
In-app purchases
RxMarbles
No in-app purchases
Kanji Trainer
- Premium$9.991 Year
