# Data Structure Display vs Codelet

The clearest difference is in-app purchases: Codelet at none against Data Structure Display's 1. Codelet also leads on rating (4.7 vs 4.5) and update cadence (every 2 months vs every 5 months). Data Structure Display's advantage is ratings volume (676 vs 127) and review sentiment (62% vs 53%). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Data Structure Display sells 1 one-off in-app purchase. Codelet asks for nothing beyond the download.

Codelet holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Data Structure Display has 676 ratings behind it against 127, so its average is the more settled of the two. Written reviews complicate that: 62% of Data Structure Display's written reviews are positive against 53% of Codelet's, so the app with the better star average is not the one people write more warmly about.

Data Structure Display ships an update every 5 months, Codelet every 2 months. The most recent releases landed on September 24, 2026 and August 13, 2026 respectively.

## The numbers

| Metric | Data Structure Display | Codelet |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (676 ratings)](https://appshunter.io/ios/app/data-structure-display/id1455489695/reviews) | **[4.7 (127 ratings)](https://appshunter.io/ios/app/codelet/id1517315454/reviews)** |
| Number of ratings | **676** | 127 |
| Positive reviews | **61.9% of reviews** | 53.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 8 MB | 25 MB |
| Requires iOS | **13.0** | 13.4 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jinan Matrix Information Technology Co., Ltd.](https://appshunter.io/developer/1009091575) | [Codelet LLC](https://appshunter.io/developer/1517315453) |

## What reviewers say

### 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


### Codelet

[App page](https://appshunter.io/ios/app/codelet/id1517315454)

Prepare for technical interviews by identifying core coding patterns and analyzing your performance. Practice coding questions conveniently to improve your skills and pinpoint areas for growth.

**Highlights:** Identify core patterns, Analyze approaches, Track performance, Identify improvement areas, Practice coding questions, Anytime, anywhere practice

**In-app purchases:** none


## Frequently asked questions

### Is Data Structure Display free?

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

### Is Codelet free?

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

### Which has better reviews, Data Structure Display or Codelet?

Codelet is rated higher. Data Structure Display averages 4.5 out of 5 from 676 ratings, while Codelet averages 4.7 from 127 ratings.

### Do Data Structure Display or Codelet have ads?

Neither Data Structure Display nor Codelet shows ads.

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

Data Structure Display ships an update every 5 months, and Codelet every 2 months. Most recently, Data Structure Display was updated on September 24, 2026 and Codelet on August 13, 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.*