# Double Down vs Blackjack | 21

The clearest difference is in-app purchases: Double Down at none against Blackjack | 21's 4. Double Down also leads on ads (none vs shown) and rating (4.8 vs 4.6). Blackjack | 21's advantage is update cadence (every 3 days vs weekly) and ratings volume (41 vs 5). On price and iOS requirement there is nothing between them.

Both are free to download. Blackjack | 21 sells 4 one-off in-app purchases. Double Down asks for nothing beyond the download.

Double Down holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Blackjack | 21 has 41 ratings behind it against 5, so its average is the more settled of the two.

Double Down ships an update weekly, Blackjack | 21 every 3 days. The most recent releases landed on October 13, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Double Down | Blackjack | 21 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/double-down-blackjack-trainer/id6777006186/reviews)** | [4.6 (41 ratings)](https://appshunter.io/ios/app/blackjack-21/id6790571321/reviews) |
| Number of ratings | 5 | **41** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Weekly | **Every 3 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 20 MB | 27 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Neeraj Aggarwal](https://appshunter.io/developer/1877631231) | [High Roller Studios](https://appshunter.io/developer/6790571323) |

## What reviewers say

### Double Down

[App page](https://appshunter.io/ios/app/double-down-blackjack-trainer/id6777006186)

Learn the math behind blackjack strategy with detailed breakdowns of expected value, probabilities, and decision-making. Practice with customizable rules and track your progress through focused lessons and drills.

**Highlights:** Expected value breakdown, Win/push/loss probabilities, Customizable table rules, Progress tracking, Focused strategy lessons, Ad-free experience

**Features:** Vision Pro support

**In-app purchases:** none


### Blackjack | 21

[App page](https://appshunter.io/ios/app/blackjack-21/id6790571321)

Practice blackjack with a personalized coach and interactive lessons. Improve your strategy through skill-based progression, tournaments, and detailed stats without risking real money.

**Highlights:** Personalized blackjack coach, Interactive lessons for strategy, Skill-based progression system, Weekly seeded tournaments, Detailed lifetime statistics, Customizable table rules, Haptic and sound feedback

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small chip pack | $0.99 | one-time |
| Medium chip pack | $2.99 | one-time |
| Large chip pack | $4.99 | one-time |
| Mega chip pack | $9.99 | one-time |


## Frequently asked questions

### Is Double Down free?

Double Down is free to download, with no in-app purchases.

### Is Blackjack | 21 free?

Blackjack | 21 is free to download, with in-app purchases available.

### Which has better reviews, Double Down or Blackjack | 21?

Double Down is rated higher. Double Down averages 4.8 out of 5 from 5 ratings, while Blackjack | 21 averages 4.6 from 41 ratings.

### Do Double Down or Blackjack | 21 have ads?

Blackjack | 21 shows ads; Double Down does not.

### Which is updated more often, Double Down or Blackjack | 21?

Double Down ships an update weekly, and Blackjack | 21 every 3 days. Most recently, Double Down was updated on October 13, 2026 and Blackjack | 21 on October 4, 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.*