Comparison

JSBox vs Leaflet for Swift&Algorithm

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

Head to head
About

JSBox

This app is a mobile JavaScript IDE that allows users to learn and write JavaScript code. It provides tools to create native iOS utilities, widgets, extensions, and more, catering to both beginners and experienced developers.

Highlights
  • Mobile JavaScript IDE
  • Create native iOS utilities
  • Design widgets and keyboards
  • Siri/Shortcuts integration
  • Beautiful code editor
  • Advanced development tools
  • iOS extension support
Features
Read full description

* JSBox is featured by: sspai.com, Price Tag, AppSolution etc # What's JSBox? JSBox is an Integrated Development Environment for JavaScript. You can learn to code JavaScript here, as we provide tons of utilities to enhance the development experience. JSBox is amazing for both beginners and experienced engineers. Don't you wanna try it out? Don't hesitate to create cool stuff—do it now! # What can JSBox do? Of course you can write JavaScript, but the most important thing is that you can create native iOS utilities, such as: - Upload photos you have just taken to the server - Create a widget to check bus information - Schedule tasks by leveraging date-based or location-based notifications - Design an extension for the Photos app to search photos directly - Design your own widget and keyboard - Make a real-time tool to query the exchange rate - Collect your most important contacts and handle it on the widget There are many possibilities; we believe you can create coolest stuff. # What's in JSBox? JSBox is not only a full-fledged environment for standard JavaScript, but also provides many utilities: - A safe environment to run JavaScript natively with incredible performance - A beautiful editor to write JavaScript, multiple themes, auto-completion, and snippets... - Many advanced development tools: lint, prettier, diff viewer and database viewer... - A desktop extension to write code extremely fast and comfortable - Almost all the cool tech in iOS: Siri/Shortcuts, Today Widget, Action Extension, 3D Touch, Home Screen Shortcut... - A lot of awesome examples for beginner We are still working on it and will introduce cooler features in the future. # Terms of Use https://jsboxbbs.com/d/1035-terms-of-service # Privacy Policy https://jsboxbbs.com/d/1034-privacy-policy # Contact us! Please contact us in the following ways. Don't hesitate to report any issues. Thank you! - [Community](https://en.jsboxbbs.com) - [Email](mailto:log.e@qq.com) - [Twitter](https://twitter.com/cyanapps) - [Weibo](https://weibo.com/0x00eeee)

About

Leaflet for Swift&Algorithm

This app offers comprehensive learning modules for Swift, SwiftUI, and Combine, alongside data structures and algorithms. It provides micro-classes, tutorials, code style guides, and practical examples to help users master programming concepts and develop efficient applications.

Highlights
  • Swift language tutorials
  • SwiftUI and Combine development
  • Data structure and algorithm learning
  • Micro-classes for core concepts
  • Code style guide
  • Algorithm problem-solving examples
Features
Read full description

Leaflet helps you learn Swift/SwiftUI and Data Structure/Algorithms better. Leaflet has four main functions: 【1】Algorithm Animation Visualization Through exquisite and intuitive animation demos, abstract algorithms and data structures are made visual — every step of execution is clearly visible. This is the core highlight of Leaflet. - Animation Demos: Carefully selected classic algorithms (sorting, searching, graph algorithms, dynamic programming, recursion, etc.) built with SwiftUI + Combine for smooth animations that make algorithm execution crystal clear. - Interactive Playback: Support play, pause, step forward / step backward, and adjustable playback speed — control your learning pace freely. - Data Structure Visualization: Arrays, linked lists, stacks, queues, trees, graphs and other data structures are presented graphically; insert, delete, and traverse operations are intuitive at a glance. - Synchronized Code View: Animation demos are displayed alongside the corresponding Swift source code, letting you learn code while watching the animation — more efficient learning. - Complexity Analysis: Visually shows the time / space complexity trends of algorithms, helping you build performance-analysis thinking. Learning algorithms is no longer dry code reading, but a vivid visual experience — every algorithm becomes something you can "see and touch". 【2】Swift Tutorial - Swift one-hour micro class, quickly master the core knowledge points of Swift grammar - Swift5 complete tutorial covering all language features from beginner to advanced - Swift Code Style Guide for writing more standardized code - Swift design pattern practice 【3】Swift + SwiftUI + Combine SwiftUI's declarative UI paired with Combine's functional reactive framework — simple to learn, high-performance, and reliable, enabling developers to quickly build elegant applications. 【4】Algorithm Solutions Curated representative algorithm problems implemented in Swift, covering data structures and algorithm analysis to help you master algorithm complexity and performance analysis. Part of the application is based on the open source protocol from the following open source libraries, Gratitude: https://github.com/raywenderlich/swift-algorithm-club , Algorithms and data structures in Swift, with explanations! https://github.com/andyRon/swift-algorithm-club-cn, swift-algorithm-club's translation. Learn algorithms and data structures using Swift.

Screenshots

JSBox4 screens
Leaflet for Swift&Algorithm4 screens

Verdict

The call

The clearest difference is rating: Leaflet for Swift&Algorithm at 4.6 against JSBox's 4.0. Leaflet for Swift&Algorithm also leads on review sentiment (71% vs 50%) and update cadence (every 6 days vs fortnightly). JSBox's advantage is iOS requirement (14.0 vs 26.0). On price, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. JSBox sells 2 in-app purchases, starting at $7.99 per year and Leaflet for Swift&Algorithm sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Leaflet for Swift&Algorithm holds the better App Store score, 4.6 against 4.0. Both are backed by a comparable volume of ratings — 85 and 297 respectively. Written reviews point the same way: 50% of JSBox's written reviews are positive against 71% of Leaflet for Swift&Algorithm's.

UpkeepUpdate frequency

JSBox ships an update fortnightly, Leaflet for Swift&Algorithm every 6 days. The most recent releases landed on September 24, 2026 and September 21, 2026 respectively.

Scorecard5 real differences · 5 level
JSBox versus Leaflet for Swift&Algorithm: the parameters behind the verdict, then further details
ParameterJSBoxLeaflet for Swift&Algorithm
PriceFreeFree
Rating4.0 (85 ratings)4.6 (297 ratings) — better
Positive reviews49.5% of reviews71.4% of reviews — better
Number of ratings85297 — better
Update frequencyFortnightlyEvery 6 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.0 — better26.0
Further details — not scored
Size178 MB54 MB
Age rating4+4+
Developer颖 钟雷 戴

Customer experience

JSBox

All ratings85 ratings
Positive74.1%
Neutral1.2%
Negative24.7%
Written reviews107 reviews
Positive49.5%
Neutral3.7%
Negative46.7%

Leaflet for Swift&Algorithm

All ratings297 ratings
Positive89.2%
Neutral3.4%
Negative7.4%
Written reviews42 reviews
Positive71.4%
Neutral7.1%
Negative21.4%

Bugs and requests

JSBox

Not enough reviews yet to summarise bugs or requests.

Leaflet for Swift&Algorithm

Reported bugs

11 issues
  • Solutions for problems are not loading
  • App crashes on first load
  • App crashes immediately on launch
  • App crashes after first use and backgrounding
  • Paid for pro user, but no answers for many questions
Show 6 more
  • Navigation tabs become black in dark mode, not full dark mode
  • Note editing removes indentation
  • Problem tags inconsistent with actual solutions
  • Label page freezes after continuous clicking
  • Code formatting is messy in notes after saving
  • Issues with membership verification across devices

Requested features

24 requests
  • Add more iOS technical upgrades
  • Add filter options for algorithms (e.g., top 100, top 200)
  • Allow users to write their own notes for algorithms
  • Add JavaScript examples
  • Allow users to suggest/edit explanations (wiki-like)
Show 19 more
  • Add settings option with restore purchase based on user level
  • Add account system for syncing notes across devices
  • Add search functionality by keyword
  • Add search functionality by problem number
  • Add difficulty selection for tags
  • Add time and space complexity for solutions
  • Remember last viewed problem in company-categorized lists
  • Add tab button for coding
  • Add solution ideas/approaches
  • Add comments to problems for beginners
  • Add filter for marked as seen/unseen
  • Add more languages for implementations
  • Add PAT problem question bank
  • Add landscape mode for tablets or code viewing
  • Optimize responsive display for iPad Pro horizontal view
  • Add Chinese language option
  • Add more C++ solutions
  • Add more solutions overall
  • Optimize tag confirmation step

In-app purchases

2 purchases

JSBox

Subscriptions2
  • JSBox Pro$7.991 Year
  • JSBox Pro - Discount$7.991 Year
1 purchases

Leaflet for Swift&Algorithm

One-time1
  • Get Pro Version$0.99

Questions

Is JSBox free?
JSBox is free to download, with in-app purchases available.
Is Leaflet for Swift&Algorithm free?
Leaflet for Swift&Algorithm is free to download, with in-app purchases available.
Which has better reviews, JSBox or Leaflet for Swift&Algorithm?
Leaflet for Swift&Algorithm is rated higher. JSBox averages 4.0 out of 5 from 85 ratings, while Leaflet for Swift&Algorithm averages 4.6 from 297 ratings.
Do JSBox or Leaflet for Swift&Algorithm have ads?
Neither JSBox nor Leaflet for Swift&Algorithm shows ads.
Which is updated more often, JSBox or Leaflet for Swift&Algorithm?
JSBox ships an update fortnightly, and Leaflet for Swift&Algorithm every 6 days. Most recently, JSBox was updated on September 24, 2026 and Leaflet for Swift&Algorithm on September 21, 2026.

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