# SpeedJack 21 vs Seotda Rank Trainer

The clearest difference is update cadence: SpeedJack 21 at fortnightly against Seotda Rank Trainer's every 3 months. SpeedJack 21 also leads on iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

SpeedJack 21 ships an update fortnightly, Seotda Rank Trainer every 3 months. The most recent releases landed on October 20, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | SpeedJack 21 | Seotda Rank 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 | No |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Every 3 months |
| Monetization | Ad-supported | — |
| Size | 86 MB | 41 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [KwangRim Ahn](https://appshunter.io/developer/1511287770) | [SiU Ahn](https://appshunter.io/developer/1601025745) |

## 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


### Seotda Rank Trainer

[App page](https://appshunter.io/ios/app/seotda-rank-trainer/id6765870404)

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

**In-app purchases:** none


## Frequently asked questions

### Is SpeedJack 21 free?

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

### Is Seotda Rank Trainer free?

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

### Do SpeedJack 21 or Seotda Rank Trainer have ads?

Both SpeedJack 21 and Seotda Rank Trainer show ads.

### Which is updated more often, SpeedJack 21 or Seotda Rank Trainer?

SpeedJack 21 ships an update fortnightly, and Seotda Rank Trainer every 3 months. Most recently, SpeedJack 21 was updated on October 20, 2026 and Seotda Rank 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.*