# Math workout brain puzzle vs PDF Extender

The clearest difference is in-app purchases: Math workout brain puzzle at none against PDF Extender's 1. Math workout brain puzzle also leads on iOS requirement (15.0 vs 17.0). PDF Extender's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 31 months). On price and device support there is nothing between them.

Both are free to download. PDF Extender sells 1 one-off in-app purchase. Math workout brain puzzle asks for nothing beyond the download.

Math workout brain puzzle ships an update every 31 months, PDF Extender every 3 weeks. The most recent releases landed on October 12, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Math workout brain puzzle | PDF Extender |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 31 months | **Every 3 weeks** |
| Size | 10 MB | 7 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Merbin Joe](https://appshunter.io/developer/1281696078) | [SB Labs](https://appshunter.io/developer/6808787098) |

## What reviewers say

### Math workout brain puzzle

[App page](https://appshunter.io/ios/app/math-workout-brain-puzzle/id1574342689)

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

**In-app purchases:** none


### PDF Extender

[App page](https://appshunter.io/ios/app/pdf-extender/id6808786886)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro freischalten | $2.99 | one-time |


## Frequently asked questions

### Is Math workout brain puzzle free?

Math workout brain puzzle is free to download, with no in-app purchases.

### Is PDF Extender free?

PDF Extender is free to download, with in-app purchases available.

### Do Math workout brain puzzle or PDF Extender have ads?

Math workout brain puzzle shows ads; PDF Extender does not.

### Which is updated more often, Math workout brain puzzle or PDF Extender?

Math workout brain puzzle ships an update every 31 months, and PDF Extender every 3 weeks. Most recently, Math workout brain puzzle was updated on October 12, 2026 and PDF Extender on October 24, 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.*