Comparison

RxMarbles vs Swift is Fun

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Interactive observable diagrams
  • Visualization of event streams
  • Demonstration of composition operators
  • Educational tool for asynchronous programming
  • Explains observer pattern extensions
Features
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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.

About

Swift is Fun

Learn Swift programming with interactive lessons, quizzes, and coding challenges. This app gamifies the learning process, allowing users to progress through content, solve problems, and track achievements as they build iOS development skills.

Highlights
  • Interactive Swift lessons
  • Coding exercises with instant feedback
  • Quizzes to reinforce concepts
  • Real code challenges
  • Progress tracking and achievements
  • Gamified learning experience
Features
Read full description

Learn Swift by writing real code, solving interactive challenges, and building your programming skills step by step. Swift is fun makes learning Swift engaging and practical. Go beyond reading theory and answering quizzes — practice coding, fix bugs, and learn how Swift works through hands-on exercises. LEARN BY DOING Explore Swift programming concepts through bite-sized lessons, clear explanations, and practical examples. WRITE REAL SWIFT CODE Practice writing code directly in the app. Complete coding challenges and apply what you've learned. FIX BUGS AND IMPROVE YOUR SKILLS Find mistakes, correct broken code, and develop your understanding of Swift syntax and programming logic. MAKE LEARNING FUN Progress through lessons, unlock new content, and track your achievements as you develop your coding skills. Whether you're just getting started with Swift or looking for more coding practice, Swift is fun helps you learn through experience. Start your Swift programming journey today! Features: • Interactive Swift lessons for beginners • Coding exercises with instant feedback • Quizzes to reinforce key concepts • Real code challenges and problem solving • Progress tracking and achievements • Multiple learning activities and game mechanics • Learn at your own pace • Designed specifically for aspiring iOS developers Whether you're completely new to programming or looking to strengthen your Swift fundamentals, SwiftPracticeFun provides a structured and engaging way to learn. Start your Swift journey today and take your first steps toward iOS development.

Screenshots

RxMarbles3 screens
Swift is Fun4 screens

Verdict

The call

The clearest difference is in-app purchases: RxMarbles at none against Swift is Fun's 2. RxMarbles also leads on ratings volume (16 vs 1) and iOS requirement (9.2 vs 17.6). Swift is Fun's advantage is update cadence (every 2 weeks vs every 4 months). On price, rating, ads and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Swift is Fun sells 2 in-app purchases, starting at $9.99 per month. RxMarbles asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for RxMarbles against 5.0 for Swift is Fun. That said, the two scores are not equally well evidenced: RxMarbles has 16 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

RxMarbles ships an update every 4 months, Swift is Fun every 2 weeks. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

Scorecard5 real differences · 5 level
RxMarbles versus Swift is Fun: the parameters behind the verdict, then further details
ParameterRxMarblesSwift is Fun
PriceFreeFree
Rating4.9 (16 ratings)5.0 (1 ratings) — better
Positive reviews84.0% of reviews—
Number of ratings16 — better1
Update frequencyEvery 4 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS9.2 — better17.6
Further details — not scored
Size21 MB64 MB
Age rating4+9+
DeveloperAnjLabEvgeniia Bruiko

Customer experience

RxMarbles

All ratings16 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews25 reviews
Positive84.0%
Neutral0.0%
Negative16.0%

Swift is Fun

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

RxMarbles

No in-app purchases

2 purchases

Swift is Fun

Subscriptions2
  • Monthly Premium$9.991 Month
  • Yearly Premium$79.991 Year

Questions

Is RxMarbles free?
RxMarbles is free to download, with no in-app purchases.
Is Swift is Fun free?
Swift is Fun is free to download, with in-app purchases available.
Which has better reviews, RxMarbles or Swift is Fun?
Swift is Fun is rated higher. RxMarbles averages 4.9 out of 5 from 16 ratings, while Swift is Fun averages 5.0 from 1 ratings.
Do RxMarbles or Swift is Fun have ads?
Neither RxMarbles nor Swift is Fun shows ads.
Which is updated more often, RxMarbles or Swift is Fun?
RxMarbles ships an update every 4 months, and Swift is Fun every 2 weeks. Most recently, RxMarbles was updated on October 24, 2026 and Swift is Fun on October 22, 2026.

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