# DSA Master vs Counting and Probability

The clearest difference is rating: Counting and Probability at 5.0 against DSA Master's 4.2. Counting and Probability also leads on in-app purchases (none vs 1) and ads (none vs shown). DSA Master's advantage is update cadence (weekly vs every 8 months) and ratings volume (35 vs 7). On price and device support there is nothing between them.

Both are free to download. DSA Master sells 1 one-off in-app purchase. Counting and Probability asks for nothing beyond the download.

Counting and Probability holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: DSA Master has 35 ratings behind it against 7, so its average is the more settled of the two.

DSA Master ships an update weekly, Counting and Probability every 8 months. The most recent releases landed on September 22, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | DSA Master | Counting and Probability |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (35 ratings)](https://appshunter.io/ios/app/dsa-master-data-and-algorithms/id1672776683/reviews) | **[5.0 (7 ratings)](https://appshunter.io/ios/app/counting-and-probability/id6444738269/reviews)** |
| Number of ratings | **35** | 7 |
| Positive reviews | 12.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 8 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 150 MB | 8 MB |
| Requires iOS | 16.2 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Alok Singh](https://appshunter.io/developer/1508795536) | [DEEPPATH LLC](https://appshunter.io/developer/1531915855) |

## What reviewers say

### DSA Master

[App page](https://appshunter.io/ios/app/dsa-master-data-and-algorithms/id1672776683)

Master algorithms and data structures with interactive visualizations, executable code, and practice challenges. Supports multiple programming languages and offers progress tracking for technical interview preparation.

**Highlights:** Interactive visualizations, Live code execution, Multi-language support, Practice challenges, Progress tracking, Algorithm animations

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### Counting and Probability

[App page](https://appshunter.io/ios/app/counting-and-probability/id6444738269)

Access a curated collection of math competition problems focused on counting and probability. This app provides detailed solutions, bookmarking features for review, and note-taking capabilities to aid your study.

**Highlights:** Math competition problem collection, Detailed solutions provided, Bookmark problems for review, Note-taking for study, Organized problem collection

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is DSA Master free?

DSA Master is free to download, with in-app purchases available.

### Is Counting and Probability free?

Counting and Probability is free to download, with no in-app purchases.

### Which has better reviews, DSA Master or Counting and Probability?

Counting and Probability is rated higher. DSA Master averages 4.2 out of 5 from 35 ratings, while Counting and Probability averages 5.0 from 7 ratings.

### Do DSA Master or Counting and Probability have ads?

DSA Master shows ads; Counting and Probability does not.

### Which is updated more often, DSA Master or Counting and Probability?

DSA Master ships an update weekly, and Counting and Probability every 8 months. Most recently, DSA Master was updated on September 22, 2026 and Counting and Probability on September 28, 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.*