# SpeedJack 21 vs Mental Math Practice & Games

The clearest difference is in-app purchases: SpeedJack 21 at none against Mental Math Practice & Games's 3. SpeedJack 21 also leads on iOS requirement (13.0 vs 17.0). Mental Math Practice & Games's advantage is ads (none vs shown) and ratings volume (25 vs 1). On price, rating and device support there is nothing between them.

Both are free to download. Mental Math Practice & Games sells 3 in-app purchases, starting at $1.99 per month. SpeedJack 21 asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for SpeedJack 21 against 4.9 for Mental Math Practice & Games. That said, the two scores are not equally well evidenced: Mental Math Practice & Games has 25 ratings behind it against 1, so its average is the more settled of the two.

SpeedJack 21 ships an update fortnightly, Mental Math Practice & Games every 5 days. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | SpeedJack 21 | Mental Math Practice & Games |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/speedjack-21/id1511287771/reviews)** | [4.9 (25 ratings)](https://appshunter.io/ios/app/mental-math-practice-and-games/id6478062751/reviews) |
| Number of ratings | 1 | **25** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 5 days** |
| Monetization | **Ad-supported** | Freemium |
| Size | 86 MB | 13 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 12+ | 4+ |
| Developer | [KwangRim Ahn](https://appshunter.io/developer/1511287770) | [Jeffrey Holliday](https://appshunter.io/developer/382922569) |

## 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


### Mental Math Practice & Games

[App page](https://appshunter.io/ios/app/mental-math-practice-and-games/id6478062751)

Sharpen your arithmetic skills with timed challenges and interactive lessons. Compete with friends on leaderboards or practice independently to improve speed and accuracy across various math operations. The app adapts to your skill level, from basic facts to complex calculations.

**Highlights:** Timed math challenges, Interactive step-by-step lessons, Leaderboard competition, Progress tracking and streaks, Adaptive difficulty levels, Addition, subtraction, multiplication, division practice

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Practice Monthly | $1.99 | per month |
| Pro Practice (6 Months) | $8.99 | per 6 months |
| Pro Practice (Annual) | $9.99 | per year |


## Frequently asked questions

### Is SpeedJack 21 free?

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

### Is Mental Math Practice & Games free?

Mental Math Practice & Games is free to download, with in-app purchases available.

### Which has better reviews, SpeedJack 21 or Mental Math Practice & Games?

SpeedJack 21 is rated higher. SpeedJack 21 averages 5.0 out of 5 from 1 ratings, while Mental Math Practice & Games averages 4.9 from 25 ratings.

### Do SpeedJack 21 or Mental Math Practice & Games have ads?

SpeedJack 21 shows ads; Mental Math Practice & Games does not.

### Which is updated more often, SpeedJack 21 or Mental Math Practice & Games?

SpeedJack 21 ships an update fortnightly, and Mental Math Practice & Games every 5 days. Most recently, SpeedJack 21 was updated on October 20, 2026 and Mental Math Practice & Games on October 24, 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.*