# Card Adder 21 vs Blackjack Solver

The clearest difference is monetization model: Card Adder 21 at free against Blackjack Solver's freemium. Blackjack Solver's advantage is ratings volume (5 vs 1). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Card Adder 21 sells 1 one-off in-app purchase and Blackjack Solver sells 2 in-app purchases, starting at $7.99 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 Blackjack Solver. That said, the two scores are not equally well evidenced: Blackjack Solver has 5 ratings behind it against 1, so its average is the more settled of the two.

Card Adder 21 ships an update every 5 days, Blackjack Solver weekly. The most recent releases landed on September 7, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | Card Adder 21 | Blackjack Solver |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/card-adder-21/id6748666396/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/blackjack-solver/id6751151674/reviews) |
| Number of ratings | 1 | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Weekly |
| Monetization | **Free** | Freemium |
| Size | 79 MB | 29 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | +17 |
| Developer | [Dot Business Integrated Solutions](https://appshunter.io/developer/1808206089) | [Tengy LLc](https://appshunter.io/developer/1833711302) |

## 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 |


### Blackjack Solver

[App page](https://appshunter.io/ios/app/blackjack-solver/id6751151674)

Master blackjack strategy and card counting with this comprehensive training platform. It offers interactive practice modes, real-time counting with true count calculations, and adaptive basic strategy recommendations. Track your progress with detailed performance analytics and customizable game rules.

**Highlights:** Solver Mode for manual analysis, Practice Mode with automatic dealing, Real-time Hi-Lo card counting, Adaptive basic strategy recommendations, Detailed performance analytics, Customizable game rules

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Plan | $7.99 | per month |
| Pro | $9.99 | per month |


## Frequently asked questions

### Is Card Adder 21 free?

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

### Is Blackjack Solver free?

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

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

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

### Do Card Adder 21 or Blackjack Solver have ads?

Neither Card Adder 21 nor Blackjack Solver shows ads.

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

Card Adder 21 ships an update every 5 days, and Blackjack Solver weekly. Most recently, Card Adder 21 was updated on September 7, 2026 and Blackjack Solver on September 4, 2026.

---

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