# Sentence Builder Master Pro vs ReadFlow

The clearest difference is in-app purchases: Sentence Builder Master Pro at none against ReadFlow's 2. Sentence Builder Master Pro also leads on iOS requirement (15.6 vs 17.0). ReadFlow's advantage is update cadence (every 2 months vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. ReadFlow sells 2 in-app purchases, starting at $5.99 per month. Sentence Builder Master Pro asks for nothing beyond the download.

Sentence Builder Master Pro ships an update every 3 months, ReadFlow every 2 months. The most recent releases landed on October 10, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Sentence Builder Master Pro | ReadFlow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (46 ratings)](https://appshunter.io/ios/app/sentence-builder-master-pro/id1236551331/reviews)** | — |
| Number of ratings | **46** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 46 MB | 33 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Imanol Fernandez Gorostizaga](https://appshunter.io/developer/313095639) | [Paul Ekirapa](https://appshunter.io/developer/1818887572) |

## 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


### ReadFlow

[App page](https://appshunter.io/ios/app/readflow-rsvp-speed-reader/id6760659861)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $5.99 | per month |
| Premium Yearly | $34.99 | per year |


## Frequently asked questions

### Is Sentence Builder Master Pro free?

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

### Is ReadFlow free?

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

### Do Sentence Builder Master Pro or ReadFlow have ads?

Neither Sentence Builder Master Pro nor ReadFlow shows ads.

### Which is updated more often, Sentence Builder Master Pro or ReadFlow?

Sentence Builder Master Pro ships an update every 3 months, and ReadFlow every 2 months. Most recently, Sentence Builder Master Pro was updated on October 10, 2026 and ReadFlow on October 3, 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.*