# Algorithms HQ vs Data Structure Display

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.

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.

## The numbers

| Metric | Algorithms HQ | Data Structure Display |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/algorithms-hq/id660610218/reviews) | **[4.5 (676 ratings)](https://appshunter.io/ios/app/data-structure-display/id1455489695/reviews)** |
| Number of ratings | 1 | **676** |
| Positive reviews | **100.0% of reviews** | 61.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 5 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 8 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Cyril Carrez](https://appshunter.io/developer/660610221) | [Jinan Matrix Information Technology Co., Ltd.](https://appshunter.io/developer/1009091575) |

## What reviewers say

### Algorithms HQ

[App page](https://appshunter.io/ios/app/algorithms-hq/id660610218)

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.

**Highlights:** Animated algorithm execution, Step-by-step instruction control, Pseudo-code and variable tracking, Customizable input data, Algorithm reference guide, Data structure evolution visualization

**Features:** macOS Compatibility

**In-app purchases:** none


### Data Structure Display

[App page](https://appshunter.io/ios/app/data-structure-display/id1455489695)

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:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all data structures | $2.99 | one-time |

**What reviewers like**

- 📚 Excellent for DSA learning and studying
- ✨ Interactive components and pseudo code quality
- 👍 Good reference material for beginners
- 🎓 Unique educational content

**What reviewers complain about**

- 🔒 90% of content locked behind $2.99 paywall
- 📖 Incomplete coverage of data structures
- ✍️ Poor grammar and spelling
- 📱 No dark mode support on macOS
- 🔔 Excessive review prompts

**Reported bugs**

- Aggressive review request frequency
- Inconsistent dark mode functionality between iOS and macOS

**Requested features**

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


## Frequently asked questions

### Is Algorithms HQ free?

Algorithms HQ is free to download, with no in-app purchases.

### Is Data Structure Display free?

Data Structure Display is free to download, with in-app purchases available.

### Which has better reviews, Algorithms HQ or Data Structure Display?

Data Structure Display is rated higher. Algorithms HQ averages 4.0 out of 5 from 1 ratings, while Data Structure Display averages 4.5 from 676 ratings.

### Do Algorithms HQ or Data Structure Display have ads?

Neither Algorithms HQ nor Data Structure Display shows ads.

### Which is updated more often, Algorithms HQ or Data Structure Display?

Algorithms HQ ships an update every 16 months, and Data Structure Display every 5 months. Most recently, Algorithms HQ was updated on September 24, 2026 and Data Structure Display on October 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*