# 21 Trainer vs Blackjack Strategy Trainer 21

The clearest difference is ads: 21 Trainer at none against Blackjack Strategy Trainer 21's shown. Blackjack Strategy Trainer 21's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 26.0). On price and in-app purchases there is nothing between them.

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

## The numbers

| Metric | 21 Trainer | Blackjack Strategy Trainer 21 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/blackjack-strategy-trainer-21/id6773344208/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | — | Every 8 days |
| Monetization | — | Ad-supported |
| Size | 4 MB | 83 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jan Haider](https://appshunter.io/developer/1793934579) | [CWTI Ltd](https://appshunter.io/developer/1853539145) |

## What reviewers say

### 21 Trainer

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

**In-app purchases:** none


### Blackjack Strategy Trainer 21

[App page](https://appshunter.io/ios/app/blackjack-strategy-trainer-21/id6773344208)

Master blackjack with a smart trainer that uses spaced repetition to focus on your weak hands. Practice all decisions across three rule sets with realistic casino-style gameplay. Learn the math behind every move and build confidence at the table.

**Highlights:** Spaced repetition learning, Three rule sets (S17, H17, ENHC), Full strategy chart reference, Realistic casino practice table, Structured lessons for beginners, Cloud sync across devices

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

**In-app purchases:** none


## Frequently asked questions

### Is 21 Trainer free?

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

### Is Blackjack Strategy Trainer 21 free?

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

### Do 21 Trainer or Blackjack Strategy Trainer 21 have ads?

Blackjack Strategy Trainer 21 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.*