# Preposition Builder Master Pro vs (Open Source) Mental Math

The clearest difference is rating: Preposition Builder Master Pro at 3.8 against (Open Source) Mental Math's 3.0. Preposition Builder Master Pro also leads on ratings volume (17 vs 2). (Open Source) Mental Math's advantage is monetization model (free vs paid). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Preposition Builder Master Pro holds the better App Store score, 3.8 against 3.0. That said, the two scores are not equally well evidenced: Preposition Builder Master Pro has 17 ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 0% and 0% positive.

Preposition Builder Master Pro ships an update every 2 months, (Open Source) Mental Math every 5 weeks. The most recent releases landed on October 9, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Preposition Builder Master Pro | (Open Source) Mental Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (17 ratings)](https://appshunter.io/ios/app/preposition-builder-master-pro/id1236551326/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/open-source-mental-math/id6788418444/reviews) |
| Number of ratings | **17** | 2 |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Paid | **Free** |
| Size | 45 MB | 41 MB |
| Requires iOS | **15.6** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Imanol Fernandez Gorostizaga](https://appshunter.io/developer/313095639) | [AHMET EMRE DEDELER](https://appshunter.io/developer/1870913629) |

## What reviewers say

### Preposition Builder Master Pro

[App page](https://appshunter.io/ios/app/preposition-builder-master-pro/id1236551326)

Learn English prepositions and grammar by correctly placing words to form sentences and common sayings. This game offers multiple difficulty levels, from beginner to expert, and includes a fun way to master idioms and expressions. Compete with others or practice solo to improve your language skills.

**Highlights:** Sentence building with prepositions, Multiple difficulty levels (Beginner to Expert), Proverbs and Sayings level, Time penalties for errors, Scoring based on speed and accuracy, Online multiplayer mode, Game Center integration

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

**In-app purchases:** none


### (Open Source) Mental Math

[App page](https://appshunter.io/ios/app/open-source-mental-math/id6788418444)

This application offers a free, open-source platform for practicing mental arithmetic. It features timed tests, custom drills, and a comprehensive library of mental math tricks. All content is available offline without ads or paywalls.

**Highlights:** Timed arithmetic tests, Customizable drills, Mental math tricks library, Offline progress tracking, Multiple operation types, Fast session interface

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

**In-app purchases:** none


## Frequently asked questions

### Is Preposition Builder Master Pro free?

Preposition Builder Master Pro is free to download, with no in-app purchases.

### Is (Open Source) Mental Math free?

(Open Source) Mental Math is free to download, with no in-app purchases.

### Which has better reviews, Preposition Builder Master Pro or (Open Source) Mental Math?

Preposition Builder Master Pro is rated higher. Preposition Builder Master Pro averages 3.8 out of 5 from 17 ratings, while (Open Source) Mental Math averages 3.0 from 2 ratings.

### Do Preposition Builder Master Pro or (Open Source) Mental Math have ads?

Neither Preposition Builder Master Pro nor (Open Source) Mental Math shows ads.

### Which is updated more often, Preposition Builder Master Pro or (Open Source) Mental Math?

Preposition Builder Master Pro ships an update every 2 months, and (Open Source) Mental Math every 5 weeks. Most recently, Preposition Builder Master Pro was updated on October 9, 2026 and (Open Source) Mental Math on October 6, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*