# Blackjack Strategy Trainer 21 vs Single Deck Blackjack 21

The clearest difference is price: Blackjack Strategy Trainer 21 at Free against Single Deck Blackjack 21's $0.99. Blackjack Strategy Trainer 21 also leads on iOS requirement (15.0 vs 26.2). Single Deck Blackjack 21's advantage is ads (none vs shown). On update cadence, in-app purchases and device support there is nothing between them.

Blackjack Strategy Trainer 21 is free to download; Single Deck Blackjack 21 costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Blackjack Strategy Trainer 21 ships an update weekly, Single Deck Blackjack 21 every 4 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Blackjack Strategy Trainer 21 | Single Deck Blackjack 21 |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| 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 | Yes | **No** |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | Ad-supported | — |
| Size | 83 MB | 13 MB |
| Requires iOS | **15.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [CWTI Ltd](https://appshunter.io/developer/1853539145) | [Tyler McQuade](https://appshunter.io/developer/1821094474) |

## What reviewers say

### Blackjack Strategy Trainer 21

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

Master blackjack with a strategy trainer that uses spaced repetition to adapt to your learning. Practice every hand decision with instant feedback and learn from structured lessons. Supports multiple rule sets for realistic casino training.

**Highlights:** Spaced repetition learning, Practice hit, stand, double, split, surrender, Supports S17, H17, and ENHC rule sets, Full basic strategy chart, Structured lessons for beginners, Realistic casino practice environment, Cloud sync across devices

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

**In-app purchases:** none


### Single Deck Blackjack 21

[App page](https://appshunter.io/ios/app/single-deck-blackjack-21/id6802456507)

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

**In-app purchases:** none


## Frequently asked questions

### Is Blackjack Strategy Trainer 21 free?

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

### Is Single Deck Blackjack 21 free?

Single Deck Blackjack 21 costs $0.99, with no in-app purchases.

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

Blackjack Strategy Trainer 21 shows ads; Single Deck Blackjack 21 does not.

### Which is updated more often, Blackjack Strategy Trainer 21 or Single Deck Blackjack 21?

Blackjack Strategy Trainer 21 ships an update weekly, and Single Deck Blackjack 21 every 4 days. Most recently, Blackjack Strategy Trainer 21 was updated on November 5, 2026 and Single Deck Blackjack 21 on October 31, 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.*