Algorithms HQ vs Data Structure Display
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Algorithms HQ
Learn computer science algorithms through interactive animations. Visualize data manipulation and execution step-by-step with pseudo-code tracking and variable value updates. Quickly reference algorithm characteristics and customize input data for deeper understanding.
- Animated algorithm execution
- Step-by-step instruction control
- Pseudo-code and variable tracking
- Customizable input data
- Algorithm reference guide
- Data structure evolution visualization
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A fun and didactic app to learn computer science algorithms! See how algorithms are working by watching an animation of their execution. Understand how data is manipulated as it is animated through an intuitive representation of its contents. Always know which line is executed in the pseudo-code, what are the values of the variables. Need to quickly refresh your memory? Just use the app as a quick reference on the main characteristics of each algorithm! Main features: - Execute a single instruction, or undo the previous one - Run, or rewind the algorithm until you decide to pause the execution - Adjust the speed of the animation - Best and worst case input data for sorting algorithms - Change the input data: size (up to 500), maximum value or data distribution (random, sorted, many duplicates, etc.) - For data structures, choose the next function to execute, or let a scenario choose for you, so you can see how the data structure evolves. - Landscape or portrait orientation This version contains the following algorithms: Linear Data Structures: - Linked Lists, including a view on memory - Queue - Stack Sorting algorithms: - Bubble Sort - Cocktail Sort - Gnome Sort - Insertion Sort - Quick Sort - Selection Sort More algorithms and more features are on the way!
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.
- 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
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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.
Screenshots
Verdict
The clearest difference is review sentiment: Algorithms HQ at 100% against Data Structure Display's 62%. Algorithms HQ also leads on in-app purchases (none vs 1). Data Structure Display's advantage is rating (4.5 vs 4.0) and ratings volume (676 vs 1). On price 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. Data Structure Display sells 1 one-off in-app purchase. Algorithms HQ asks for nothing beyond the download.
Data Structure Display holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: Data Structure Display has 676 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 100% of Algorithms HQ's written reviews are positive against 62% of Data Structure Display's, so the app with the better star average is not the one people write more warmly about.
Algorithms HQ ships an update every 16 months, Data Structure Display every 5 months. The most recent releases landed on September 24, 2026 and October 3, 2026 respectively.
| Parameter | Algorithms HQ | Data Structure Display |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) | 4.5 (676 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 61.9% of reviews |
| Number of ratings | 1 | 676 — better |
| Update frequency | Every 16 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPad | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 15.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Cyril Carrez | Jinan Matrix Information Technology Co., Ltd. |
Customer experience
Algorithms HQ
Data Structure Display
Bugs and requests
Algorithms HQ
Not enough reviews yet to summarise bugs or 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
In-app purchases
Algorithms HQ
No in-app purchases
Data Structure Display
- Unlock all data structures$2.99
Questions
Is Algorithms HQ free?
Is Data Structure Display free?
Which has better reviews, Algorithms HQ or Data Structure Display?
Do Algorithms HQ or Data Structure Display have ads?
Which is updated more often, Algorithms HQ or Data Structure Display?
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