# CS vs Blackjack 21

The clearest difference is price: CS at Free against Blackjack 21's $9.99. CS also leads on iOS requirement (12.0 vs 15.0). Blackjack 21's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

CS is free to download; Blackjack 21 costs $9.99 up front. CS sells 1 in-app purchase, starting at $4.99 per month. Blackjack 21 asks for nothing beyond the download.

## The numbers

| Metric | CS | Blackjack 21 |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | — |
| Size | 260 MB | 35 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Hiroyuki Oe](https://appshunter.io/developer/1709855598) | [Double Down Software](https://appshunter.io/developer/1751632262) |

## What reviewers say

### CS

[App page](https://appshunter.io/ios/app/cs-casino-card-counting-pro/id6468402910)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NO ADS | $4.99 | per month |


### Blackjack 21

[App page](https://appshunter.io/ios/app/blackjack-21-basic-strategy/id6477749240)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CS free?

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

### Is Blackjack 21 free?

Blackjack 21 costs $9.99, with no in-app purchases.

### Do CS or Blackjack 21 have ads?

CS shows ads; Blackjack 21 does not.

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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.*