# SpeedJack 21 vs Blackjack Mastery 21 Trainer

The clearest difference is in-app purchases: SpeedJack 21 at none against Blackjack Mastery 21 Trainer's 4. SpeedJack 21 also leads on iOS requirement (13.0 vs 15.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Blackjack Mastery 21 Trainer sells 4 in-app purchases, starting at $9.99 per month. SpeedJack 21 asks for nothing beyond the download.

SpeedJack 21 ships an update fortnightly, Blackjack Mastery 21 Trainer every 3 weeks. The most recent releases landed on October 20, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | SpeedJack 21 | Blackjack Mastery 21 Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/speedjack-21/id1511287771/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Ad-supported | — |
| Size | 86 MB | 44 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [KwangRim Ahn](https://appshunter.io/developer/1511287770) | [Anton Terekhov](https://appshunter.io/developer/1778000768) |

## What reviewers say

### SpeedJack 21

[App page](https://appshunter.io/ios/app/speedjack-21/id1511287771)

Practice your blackjack basic strategy with this educational app. Achieve consecutive correct answers to rank your time record on the server and improve your casino winning average.

**Highlights:** Blackjack basic strategy practice, Consecutive correct answer challenge, Server-based time ranking, Improve casino winning average, User sign-in required for challenges

**Features:** macOS Compatibility

**In-app purchases:** none


### Blackjack Mastery 21 Trainer

[App page](https://appshunter.io/ios/app/blackjack-mastery-21-trainer/id6744902920)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access | $9.99 | per month |
| Premium Access | $39.99 | per year |
| Premium Access | $39.99 | per year |
| Premium Access | $99.99 | one-time |


## Frequently asked questions

### Is SpeedJack 21 free?

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

### Is Blackjack Mastery 21 Trainer free?

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

### Do SpeedJack 21 or Blackjack Mastery 21 Trainer have ads?

Both SpeedJack 21 and Blackjack Mastery 21 Trainer show ads.

### Which is updated more often, SpeedJack 21 or Blackjack Mastery 21 Trainer?

SpeedJack 21 ships an update fortnightly, and Blackjack Mastery 21 Trainer every 3 weeks. Most recently, SpeedJack 21 was updated on October 20, 2026 and Blackjack Mastery 21 Trainer on October 28, 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.*