# Data Structure Display vs Codeclock

The clearest difference is in-app purchases: Codeclock at none against Data Structure Display's 1. Data Structure Display's advantage is review sentiment (62% vs 50%). On price, update cadence, ads and device support there is nothing between them.

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

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

## The numbers

| Metric | Data Structure Display | Codeclock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (676 ratings)](https://appshunter.io/ios/app/data-structure-display/id1455489695/reviews)** | — |
| Number of ratings | **676** | — |
| Positive reviews | **61.9% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 8 MB | 46 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Jinan Matrix Information Technology Co., Ltd.](https://appshunter.io/developer/1009091575) | [Naman Anand](https://appshunter.io/developer/1682061807) |

## 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


### Codeclock

[App page](https://appshunter.io/ios/app/codeclock-coding-calendar/id6447638088)

This app helps competitive programmers track coding contests from major platforms. It provides a comprehensive schedule, allows users to set reminders, and integrates with their device's calendar to prevent missed events.

**Highlights:** Comprehensive contest schedule, Support for major platforms (Codechef, Codeforces, LeetCode), Set contest reminders, Add contests to device calendar, User-friendly interface

**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 Codeclock free?

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

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

Neither Data Structure Display nor Codeclock shows ads.

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

Data Structure Display ships an update every 5 months, and Codeclock every 3 months. Most recently, Data Structure Display was updated on October 13, 2026 and Codeclock 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.*