# Letter Writing vs Let's Build Sentences

The clearest difference is in-app purchases: Letter Writing at none against Let's Build Sentences's 1. Let's Build Sentences's advantage is update cadence (every 4 days vs every 22 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Let's Build Sentences sells 1 one-off in-app purchase. Letter Writing asks for nothing beyond the download.

Letter Writing ships an update every 22 months, Let's Build Sentences every 4 days. The most recent releases landed on October 27, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Letter Writing | Let's Build Sentences |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 4 days** |
| Size | 20 MB | 5 MB |
| Requires iOS | 17.5 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Edology Limited](https://appshunter.io/developer/1138398693) | [Brian Leary](https://appshunter.io/developer/1869693110) |

## What reviewers say

### Letter Writing

[App page](https://appshunter.io/ios/app/letter-writing/id6503089012)

**Features:** macOS Compatibility

**In-app purchases:** none


### Let's Build Sentences

[App page](https://appshunter.io/ios/app/lets-build-sentences/id6761413051)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Unlock | $4.99 | one-time |


## Frequently asked questions

### Is Letter Writing free?

Letter Writing is free to download, with no in-app purchases.

### Is Let's Build Sentences free?

Let's Build Sentences is free to download, with in-app purchases available.

### Do Letter Writing or Let's Build Sentences have ads?

Neither Letter Writing nor Let's Build Sentences shows ads.

### Which is updated more often, Letter Writing or Let's Build Sentences?

Letter Writing ships an update every 22 months, and Let's Build Sentences every 4 days. Most recently, Letter Writing was updated on October 27, 2026 and Let's Build Sentences 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.*