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

The clearest difference is rating: Sentence Builder Master Pro at 4.6 against (Open Source) Mental Math's 3.0. Sentence Builder Master Pro also leads on review sentiment (33% vs 0%) and ratings volume (46 vs 2). (Open Source) Mental Math's advantage is monetization model (free vs paid) and update cadence (every 5 weeks vs every 3 months). On price, ads, in-app purchases and device support there is nothing between them.

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

Sentence Builder Master Pro holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: Sentence Builder Master Pro has 46 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 33% of Sentence Builder Master Pro's written reviews are positive against 0% of (Open Source) Mental Math's.

Sentence Builder Master Pro ships an update every 3 months, (Open Source) Mental Math every 5 weeks. The most recent releases landed on October 10, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Sentence Builder Master Pro | (Open Source) Mental Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (46 ratings)](https://appshunter.io/ios/app/sentence-builder-master-pro/id1236551331/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/open-source-mental-math/id6788418444/reviews) |
| Number of ratings | **46** | 2 |
| Positive reviews | **33.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | Paid | **Free** |
| Size | 46 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

### Sentence Builder Master Pro

[App page](https://appshunter.io/ios/app/sentence-builder-master-pro/id1236551331)

Learn English grammar and vocabulary by unscrambling words to form correct sentences. This educational game offers multiple difficulty levels and a fun way to improve language skills for learners of all ages. Compete with others or play solo to master sentence structure and idioms.

**Highlights:** Word unscrambling for sentence formation, Multiple difficulty levels (Beginner to Expert), Proverbs and Sayings level for idioms, Online multiplayer mode, Game Center integration, Time penalties for incorrect order

**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 Sentence Builder Master Pro free?

Sentence 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, Sentence Builder Master Pro or (Open Source) Mental Math?

Sentence Builder Master Pro is rated higher. Sentence Builder Master Pro averages 4.6 out of 5 from 46 ratings, while (Open Source) Mental Math averages 3.0 from 2 ratings.

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

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

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

Sentence Builder Master Pro ships an update every 3 months, and (Open Source) Mental Math every 5 weeks. Most recently, Sentence Builder Master Pro was updated on October 10, 2026 and (Open Source) Mental Math on October 6, 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.*