Comparison

Data Structure Display vs LeetCards

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

Head to head
About

Data Structure Display

Explore and learn data structures through dynamic debugging and visual observation of changes. This app covers linear structures, trees, graphs, and recursive algorithms like the Tower of Hanoi, offering interactive learning experiences.

Highlights
  • Dynamic data structure debugging
  • Visual observation of data structure changes
  • Learn linear structures (arrays, lists, queues, stacks)
  • Explore tree structures (binary, AVL, red-black, heap)
  • Understand graph structures and algorithms
  • Debug recursive algorithms like Tower of Hanoi
Features
Read full description

A novel data structure learning app, the most significant feature is that you can dynamically debug the data structure in this app, and visually observe the changes in the data structure during the operation. In this app you can learn the following data structures: 1. Linear structures, including arrays, linked lists, queues, stacks. Linear structures are the basis for other advanced data structures, as fine as advanced algorithms. 2. Tree structures, including binary tree, binary search tree, AVL tree, red-black tree, and heap. In this app, you can dynamically debug three traversals of the binary tree (including non-recursive traversal implementations), searching in the tree, balance adjustments in the AVL tree and red-black tree, and heap sorting. Give you the ability of handwritten red-black trees. 3. Graph structure, including the adjacency list storage representation of the graph structure, depth-first search and breadth-first search, finding the Euler path in the graph, topological sorting, maximum connected components, minimum spanning tree problem, and shortest single source Path problem. It also provides dynamic debugging of these classic graph algorithms. 4. The data structure introductory class will talk about the problem of the Tower of Hanoi. The algorithm that solves this problem is often recursive. This app provides dynamic debugging of the Tower of Hanoi problem, so you can no longer be confused about the recursive calls of the Tower of Hanoi.

About

LeetCards

Master coding interview questions with spaced repetition and curated problem sets. Track your progress, take custom notes, and compete on leaderboards to optimize your learning and land your dream job.

Highlights
  • Spaced repetition for DSA concepts
  • Curated problem sets (Grind 75, Blind 75)
  • Progress tracking (streaks, XP)
  • Custom notes for problems
  • Leaderboard for competition
Features
Read full description

LeetCards is the ultimate tool for mastering Leetcode questions through efficient and effective study techniques. Our app utilizes spaced repetition to help you learn new data structures and algorithms (DSA) concepts every day. Whether you are a beginner or an advanced coder, LeetCards is designed to optimize your learning process, ensuring you spend the right amount of time on each problem. Features: - Spaced Repetition: Learn and retain DSA concepts effectively with our scientifically-backed study method. - Curated Problem Sets: Access popular problem sets like Grind 75, Blind 75, and Neet 150. - Progress Tracking: Monitor your study streaks, cards studied, and XP gained. - Custom Notes: Create and save your own notes for each problem to aid your understanding. - Leaderboard: Compete with peers and track your ranking. Subscription/In-App Purchase Information: Title: LeetCards Pro Length of Membership: Lifetime, Monthly, Yearly Price: $89/lifetime, $59/year, $9/month Benefits: Unlock all premium problem sets, Unlimited note-taking, Progress tracking Privacy Policy: https://leetcards.com/privacy/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Ace your coding interviews and land your dream job with LeetCards. Download now and start your journey to becoming a coding expert!

Screenshots

Data Structure Display4 screens
LeetCards4 screens

Verdict

The call

The clearest difference is rating: Data Structure Display at 4.5 against LeetCards's 1.0. Data Structure Display also leads on ratings volume (676 vs 4). LeetCards's advantage is update cadence (every 3 weeks vs every 5 months). 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. Data Structure Display sells 1 one-off in-app purchase and LeetCards sells 3 in-app purchases, starting at $9.00 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Data Structure Display holds the better App Store score, 4.5 against 1.0. That said, the two scores are not equally well evidenced: Data Structure Display has 676 ratings behind it against 4, so its average is the more settled of the two.

UpkeepUpdate frequency

Data Structure Display ships an update every 5 months, LeetCards every 3 weeks. The most recent releases landed on October 13, 2026 and October 11, 2026 respectively.

Scorecard3 real differences · 7 level
Data Structure Display versus LeetCards: the parameters behind the verdict, then further details
ParameterData Structure DisplayLeetCards
PriceFreeFree
Rating4.5 (676 ratings) — better1.0 (4 ratings)
Positive reviews61.9% of reviews—
Number of ratings676 — better4
Update frequencyEvery 5 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS13.0 — better13.4
Further details — not scored
Size8 MB41 MB
Age rating4+4+
DeveloperJinan Matrix Information Technology Co., Ltd.Kittichote Kamalapirat

Customer experience

Data Structure Display

All ratings676 ratings
Positive87.1%
Neutral2.4%
Negative10.5%
Written reviews42 reviews
Positive61.9%
Neutral2.4%
Negative35.7%

LeetCards

All ratings4 ratings
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Data Structure Display

Reported bugs

2 issues
  • Aggressive review request frequency
  • Inconsistent dark mode functionality between iOS and macOS

Requested features

4 requests
  • Dark mode implementation
  • Comprehensive coverage of all data structure variants
  • More practical exercises and problems
  • Ad-supported free tier instead of paywall

LeetCards

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Data Structure Display

One-time1
  • Unlock all data structures$2.99
3 purchases

LeetCards

Subscriptions2
  • LeetCards$9.001 Month
  • LeetCards$59.001 Year
One-time1
  • LeetCards$89.00

Questions

Is Data Structure Display free?
Data Structure Display is free to download, with in-app purchases available.
Is LeetCards free?
LeetCards is free to download, with in-app purchases available.
Which has better reviews, Data Structure Display or LeetCards?
Data Structure Display is rated higher. Data Structure Display averages 4.5 out of 5 from 676 ratings, while LeetCards averages 1.0 from 4 ratings.
Do Data Structure Display or LeetCards have ads?
Neither Data Structure Display nor LeetCards shows ads.
Which is updated more often, Data Structure Display or LeetCards?
Data Structure Display ships an update every 5 months, and LeetCards every 3 weeks. Most recently, Data Structure Display was updated on October 13, 2026 and LeetCards on October 11, 2026.

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