# Fact Fluency vs LetterChallenge

The clearest difference is price: LetterChallenge at Free against Fact Fluency's $1.99. Fact Fluency's advantage is in-app purchases (none vs 1) and device support (3 vs 1). On ads and iOS requirement there is nothing between them.

LetterChallenge is free to download; Fact Fluency costs $1.99 up front. LetterChallenge sells 1 one-off in-app purchase. Fact Fluency asks for nothing beyond the download.

## The numbers

| Metric | Fact Fluency | LetterChallenge |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Fortnightly |
| Size | 17 MB | 5 MB |
| Requires iOS | **15.1** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Step Up Learning Labs](https://appshunter.io/developer/1803446550) | [Hardeep Kumar Sah](https://appshunter.io/developer/1410381102) |

## What reviewers say

### Fact Fluency

[App page](https://appshunter.io/ios/app/fact-fluency-mental-math/id6743555303)

**Features:** macOS Compatibility

**In-app purchases:** none


### LetterChallenge

[App page](https://appshunter.io/ios/app/letterchallenge/id6755724525)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access | $1.99 | one-time |


## Frequently asked questions

### Is Fact Fluency free?

Fact Fluency costs $1.99, with no in-app purchases.

### Is LetterChallenge free?

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

### Do Fact Fluency or LetterChallenge have ads?

Neither Fact Fluency nor LetterChallenge shows ads.

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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.*