# SpeedJack 21 — Blackjack Probability Practice

> Blackjack basic strategy practice and competitive time ranking. (iPhone/iPad app by KwangRim Ahn.)

- Source: https://appshunter.io/ios/app/speedjack-21/id1511287771 (this page in markdown: same URL + `.md`)
- Developer: [KwangRim Ahn](https://appshunter.io/developer/1511287770)
- Category: Education
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 12+
- Requires: iOS 13.0 · 86 MB
- Languages: English
- Released: 2024-06-23
- Data updated: 2026-06-04
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/speedjack-21/id1511287771/reviews.md

## What is SpeedJack 21?

It is an application which helps your blackjack skill. You can practice basic strategy of blackjack with this application. If you succeed 20 times consecutive correct answer, your time record spent will be ranked on the server. Please sign-in before challenge. If you can pass this challenge easily without failing in short time, your winning average at the casino will be increasing.

## Key features

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


## Frequently asked questions about SpeedJack 21

### Does SpeedJack 21 have ads?

Yes, SpeedJack 21 contains advertisements. This allows the app to remain free for users to download and practice their blackjack skills.

### What is the learning methodology of SpeedJack 21?

SpeedJack 21 focuses on practicing basic blackjack strategy through repeated challenges. Users aim for consecutive correct answers to reinforce learning and improve their game.

### How does SpeedJack 21 track progress?

Progress is tracked by the number of consecutive correct answers achieved in the basic strategy challenges. Successful completion can lead to your time record being ranked on the server.

### What devices does SpeedJack 21 support?

SpeedJack 21 is available on iPhone, iPad, and iPod devices, making it accessible for a wide range of Apple users.

### What is the age rating for SpeedJack 21?

SpeedJack 21 has an age rating of 12+, indicating it is suitable for users aged 12 and above.

### How often is SpeedJack 21 updated?

The latest version is 1.1.12, and the app was last updated on April 29, 2026. This suggests a history of updates, though future frequency is not guaranteed.

### Can I play SpeedJack 21 offline?

The description mentions ranking on a server, which implies an internet connection is needed for the competitive ranking feature. However, basic strategy practice might be possible offline.

### What is the user sentiment for SpeedJack 21?

Based on the provided data, SpeedJack 21 has a perfect rating of 5.0 stars from 1 rating, indicating a highly positive initial user experience.

## Version history (last 5 releases)

### 1.1.12 — 2026-04-29

Bug Fix

### 1.1.9 — 2026-03-17

Add Level Ranking in Carousel

### 1.1.7 — 2026-02-20

Bug Fix

### 1.1.6 — 2026-02-18

Bug Fix

### 1.1.5 — 2026-02-03

Performance Improvement

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-04.*