# Blindfold Chess vs 21 Trainer

The clearest difference is in-app purchases: 21 Trainer at none against Blindfold Chess's 5. 21 Trainer also leads on ads (none vs shown). Blindfold Chess's advantage is iOS requirement (17.0 vs 26.0). On price and device support there is nothing between them.

Both are free to download. Blindfold Chess sells 5 one-off in-app purchases. 21 Trainer asks for nothing beyond the download.

## The numbers

| Metric | Blindfold Chess | 21 Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (28 ratings)](https://appshunter.io/ios/app/blindfold-chess/id6605933514/reviews)** | — |
| Number of ratings | **28** | — |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 140 MB | 4 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Romir Patney](https://appshunter.io/developer/1662297678) | [Jan Haider](https://appshunter.io/developer/1793934579) |

## What reviewers say

### Blindfold Chess

[App page](https://appshunter.io/ios/app/blindfold-chess/id6605933514)

Sharpen your chess visualization and strategy skills with this app. It offers structured lessons, challenges against an engine, and helps you master chess notation without seeing the board.

**Highlights:** Boost visualization skills, Play against a chess engine, Structured step-by-step lessons, Maintain learning streaks, Refine notation skills, Visualize the board without seeing pieces

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |
| Lessons 4, 5, 6 | $3.99 | one-time |
| Lessons 2 & 3 | $3.99 | one-time |
| Lesson 7 | $3.99 | one-time |
| Everything Bundle | $6.99 | one-time |


### 21 Trainer

[App page](https://appshunter.io/ios/app/21-trainer/id6756545201)

**In-app purchases:** none


## Frequently asked questions

### Is Blindfold Chess free?

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

### Is 21 Trainer free?

21 Trainer is free to download, with no in-app purchases.

### Do Blindfold Chess or 21 Trainer have ads?

Blindfold Chess shows ads; 21 Trainer does not.

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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.*