# DSA Master vs Bailey Online

The clearest difference is in-app purchases: Bailey Online at none against DSA Master's 1. Bailey Online also leads on ads (none vs shown). DSA Master's advantage is update cadence (weekly vs monthly). On price, device support and iOS requirement there is nothing between them.

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

DSA Master ships an update weekly, Bailey Online monthly. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | DSA Master | Bailey Online |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (35 ratings)](https://appshunter.io/ios/app/dsa-master-data-and-algorithms/id1672776683/reviews)** | — |
| Number of ratings | **35** | — |
| Positive reviews | 11.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 150 MB | 27 MB |
| Requires iOS | 16.2 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Alok Singh](https://appshunter.io/developer/1508795536) | [OurCodeLab LLP](https://appshunter.io/developer/1533061750) |

## 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 | $9.99 | one-time |


### Bailey Online

[App page](https://appshunter.io/ios/app/bailey-online/id6745312811)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DSA Master free?

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

### Is Bailey Online free?

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

### Do DSA Master or Bailey Online have ads?

DSA Master shows ads; Bailey Online does not.

### Which is updated more often, DSA Master or Bailey Online?

DSA Master ships an update weekly, and Bailey Online monthly. Most recently, DSA Master was updated on October 27, 2026 and Bailey Online on October 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.*