# Card Adder 21 vs Blackjack Strategy + Trainer

The clearest difference is in-app purchases: Blackjack Strategy + Trainer at none against Card Adder 21's 1. Blackjack Strategy + Trainer also leads on ratings volume (5 vs 1). Card Adder 21's advantage is update cadence (every 5 days vs every 5 months) and device support (3 vs 1). On price, rating, ads and monetization model there is nothing between them.

Both are free to download. Card Adder 21 sells 1 one-off in-app purchase. Blackjack Strategy + Trainer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Card Adder 21 against 5.0 for Blackjack Strategy + Trainer. That said, the two scores are not equally well evidenced: Blackjack Strategy + Trainer 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 Strategy + Trainer every 5 months. The most recent releases landed on October 9, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Card Adder 21 | Blackjack Strategy + Trainer |
| --- | --- | --- |
| 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-strategy-plus-trainer/id6751148964/reviews) |
| Number of ratings | 1 | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 5 months |
| Monetization | Free | Free |
| Size | 79 MB | 30 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Dot Business Integrated Solutions](https://appshunter.io/developer/1808206089) | [Devolv LLC](https://appshunter.io/developer/1831828440) |

## 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 Strategy + Trainer

[App page](https://appshunter.io/ios/app/blackjack-strategy-plus-trainer/id6751148964)

Master blackjack strategy with this ad-free trainer. Practice under realistic casino conditions, customize game settings, and track your performance to improve your decision-making for live play.

**Highlights:** Adjustable deck count, Dealer hits/stands on soft 17, Resplitting options, Custom starting bankroll, Performance tracking (wins, losses, percentages), Ad-free experience, Offline play

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

**In-app purchases:** none


## Frequently asked questions

### Is Card Adder 21 free?

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

### Is Blackjack Strategy + Trainer free?

Blackjack Strategy + Trainer is free to download, with no in-app purchases.

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

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

### Do Card Adder 21 or Blackjack Strategy + Trainer have ads?

Neither Card Adder 21 nor Blackjack Strategy + Trainer shows ads.

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

Card Adder 21 ships an update every 5 days, and Blackjack Strategy + Trainer every 5 months. Most recently, Card Adder 21 was updated on October 9, 2026 and Blackjack Strategy + Trainer 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.*