Comparison

Source 3 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

Source 3

View the HTML source code of any webpage directly within Safari. This app offers customizable syntax highlighting for a better developer experience on iOS devices.

Highlights
  • View HTML source code
  • Safari extension integration
  • Customizable syntax highlighting
  • Easy access via Action icon
  • Supports iPhone and iPad
Features
Read full description

Source is an app plus a Safari extension that makes it easy to do one key web developer task: view the HTML source of any web page, with beautiful and customisable syntax highlighting. Just browse the web in Safari as you normally would, and if you want to view the source for your current page just tap the Action icon and choose Source. The following steps show you how to get extensions to enhance your browsing experience in Safari on ‌iOS 15‌. Settings app → Safari → Extensions → toggle on the app or settings.

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

Source 32 screens
Leaflet for Swift&Algorithm4 screens

Verdict

The call

The clearest difference is price: Leaflet for Swift&Algorithm at Free against Source 3's $0.99. Leaflet for Swift&Algorithm also leads on update cadence (every 8 days vs every 2 months) and review sentiment (71% vs 44%). Source 3's advantage is in-app purchases (none vs 1) and chart position (#68 vs unranked). On 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

Leaflet for Swift&Algorithm is free to download; Source 3 costs $0.99 up front. Leaflet for Swift&Algorithm sells 1 one-off in-app purchase. Source 3 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Leaflet for Swift&Algorithm holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: Leaflet for Swift&Algorithm has 297 ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 44% of Source 3's written reviews are positive against 71% of Leaflet for Swift&Algorithm's.

UpkeepUpdate frequency

Source 3 ships an update every 2 months, Leaflet for Swift&Algorithm every 8 days. The most recent releases landed on September 24, 2026 and September 26, 2026 respectively.

Scorecard9 real differences · 2 level
Source 3 versus Leaflet for Swift&Algorithm: the parameters behind the verdict, then further details
ParameterSource 3Leaflet for Swift&Algorithm
Price$0.99Free — better
Rating4.3 (10 ratings)4.6 (297 ratings) — better
Positive reviews43.8% of reviews71.4% of reviews — better
Number of ratings10297 — better
Update frequencyEvery 2 monthsEvery 8 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
Best chart rank#68 — better—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better26.0
Further details — not scored
Size1 MB53 MB
Age rating4+4+
DeveloperStreet Coder LLC雷 戴

Customer experience

Source 3

All ratings10 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews16 reviews
Positive43.8%
Neutral0.0%
Negative56.3%

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

Source 3

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

None

Source 3

No in-app purchases

1 purchases

Leaflet for Swift&Algorithm

One-time1
  • Get Pro Version$0.99

Questions

Is Source 3 free?
Source 3 costs $0.99, with no in-app purchases.
Is Leaflet for Swift&Algorithm free?
Leaflet for Swift&Algorithm is free to download, with in-app purchases available.
Which has better reviews, Source 3 or Leaflet for Swift&Algorithm?
Leaflet for Swift&Algorithm is rated higher. Source 3 averages 4.3 out of 5 from 10 ratings, while Leaflet for Swift&Algorithm averages 4.6 from 297 ratings.
Do Source 3 or Leaflet for Swift&Algorithm have ads?
Neither Source 3 nor Leaflet for Swift&Algorithm shows ads.
Which is updated more often, Source 3 or Leaflet for Swift&Algorithm?
Source 3 ships an update every 2 months, and Leaflet for Swift&Algorithm every 8 days. Most recently, Source 3 was updated on September 24, 2026 and Leaflet for Swift&Algorithm on September 26, 2026.

Other comparisons