# Card Adder 21 vs AP Blackjack Trainer

The clearest difference is monetization model: Card Adder 21 at free against AP Blackjack Trainer's free with in-app purchases. AP Blackjack Trainer's advantage is update cadence (daily vs every 5 days) and ratings volume (16 vs 1). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Card Adder 21 sells 1 one-off in-app purchase and AP Blackjack Trainer sells 1 in-app purchase, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Card Adder 21 against 5.0 for AP Blackjack Trainer. That said, the two scores are not equally well evidenced: AP Blackjack Trainer has 16 ratings behind it against 1, so its average is the more settled of the two.

Card Adder 21 ships an update every 5 days, AP Blackjack Trainer daily. The most recent releases landed on October 9, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Card Adder 21 | AP Blackjack Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/card-adder-21/id6748666396/reviews) | [5.0 (16 ratings)](https://appshunter.io/ios/app/ap-blackjack-trainer/id6749086467/reviews) |
| Number of ratings | 1 | **16** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | **Daily** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 79 MB | 274 MB |
| Requires iOS | 13.0 | **12.2** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Dot Business Integrated Solutions](https://appshunter.io/developer/1808206089) | [Ankle Bully Games](https://appshunter.io/developer/1828757898) |

## What reviewers say

### Card Adder 21

[App page](https://appshunter.io/ios/app/card-adder-21/id6748666396)

Enhance your mental math skills by tracking a running total as cards are dealt. Progress through increasingly challenging levels with a timed element. The game offers progress tracking and is designed to make counting enjoyable.

**Highlights:** Progressive difficulty levels, Timed challenges, Running total tracking, Progress tracking, Card dealing gameplay

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Card Adder 21 Pro Lifetime | $4.99 | one-time |


### AP Blackjack Trainer

[App page](https://appshunter.io/ios/app/ap-blackjack-trainer/id6749086467)

Master blackjack strategy and card counting with this focused training tool. Practice basic strategy, HILO counting, and advanced techniques. Features customizable tables, a rank-up system, and optional AI coaching for a comprehensive learning experience.

**Highlights:** Basic Strategy Training, HILO Card Counting, Customizable Strategy Tables, Running Count Tracking, Rank Up System, AI Coach (Subscription), True Count (Subscription)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AdvantageBlackjack+ Monthly | $0.99 | per month |

**What reviewers like**

- 👍 Improved blackjack skills
- 👍 Simplified and beginner-friendly
- 👍 Customizable features
- 👍 Comprehensive learning tools


## Frequently asked questions

### Is Card Adder 21 free?

Card Adder 21 is free to download, with in-app purchases available.

### Is AP Blackjack Trainer free?

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

### Which has better reviews, Card Adder 21 or AP Blackjack Trainer?

Card Adder 21 and AP Blackjack Trainer are both rated 5.0 out of 5 on the App Store, from 1 and 16 ratings respectively.

### Do Card Adder 21 or AP Blackjack Trainer have ads?

Neither Card Adder 21 nor AP Blackjack Trainer shows ads.

### Which is updated more often, Card Adder 21 or AP Blackjack Trainer?

Card Adder 21 ships an update every 5 days, and AP Blackjack Trainer daily. Most recently, Card Adder 21 was updated on October 9, 2026 and AP Blackjack Trainer on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*