# Invention Manual vs DSA Master

The clearest difference is in-app purchases: Invention Manual at none against DSA Master's 1. Invention Manual also leads on ads (none vs shown) and iOS requirement (8.0 vs 16.2). DSA Master's advantage is update cadence (weekly vs every 9 months). On price and device support there is nothing between them.

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

Invention Manual ships an update every 9 months, DSA Master weekly. The most recent releases landed on October 10, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Invention Manual | DSA Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (35 ratings)](https://appshunter.io/ios/app/dsa-master-data-and-algorithms/id1672776683/reviews)** |
| Number of ratings | — | **35** |
| Positive reviews | — | 12.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 67 MB | 150 MB |
| Requires iOS | **8.0** | 16.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Callan Hodgskin](https://appshunter.io/developer/1045848119) | [Alok Singh](https://appshunter.io/developer/1508795536) |

## What reviewers say

### Invention Manual

[App page](https://appshunter.io/ios/app/invention-manual/id1195335633)

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Invention Manual free?

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

### Is DSA Master free?

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

### Do Invention Manual or DSA Master have ads?

DSA Master shows ads; Invention Manual does not.

### Which is updated more often, Invention Manual or DSA Master?

Invention Manual ships an update every 9 months, and DSA Master weekly. Most recently, Invention Manual was updated on October 10, 2026 and DSA Master on October 9, 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.*