# Card Adder 21 — Card Adding Mental Training

> Card-based game for improving mental addition and counting skills. (iPhone/iPad app by Dot Business Integrated Solutions.)

- Source: https://appshunter.io/ios/app/card-adder-21/id6748666396 (this page in markdown: same URL + `.md`)
- Developer: [Dot Business Integrated Solutions](https://appshunter.io/developer/1808206089)
- Category: Games, Education, Board, Card
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 13.0 · 76 MB
- Languages: American English
- Released: 2025-07-17
- Data updated: 2026-07-18
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/card-adder-21/id6748666396/reviews.md

## What is Card Adder 21?

HOW TO PLAY
Cards are dealt one by one. Keep track of the running total to progress through levels. What level can you reach?

FEATURES
• Progressive difficulty levels with a timed challenge
• Progress tracking
• Ads are ONLY shown on losing segments

COMING SOON
• Game Center high scores and community records
• Personalized progress tracking

Perfect for anyone wanting to improve their mental adding and counting skills.

Download Card Adder 21 and make counting fun.

## Key features

- Progressive difficulty levels
- Timed challenges
- Running total tracking
- Progress tracking
- Card dealing gameplay

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

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



## Frequently asked questions about Card Adder 21

### How do you play Card Adder 21?

Cards are dealt one by one, and you must keep track of the running total to advance through levels. The game features progressive difficulty and a timed challenge.

### What are the main features of Card Adder 21?

Card Adder 21 offers progressive difficulty levels with timed challenges, progress tracking, and a fun card-dealing gameplay mechanic to improve mental adding skills.

### Is Card Adder 21 suitable for all ages?

Yes, Card Adder 21 has an age rating of 4+, making it suitable for a wide range of players looking to practice their counting skills.

### What devices does Card Adder 21 support?

Card Adder 21 is available on iPhone, iPad, and iPod devices, allowing users to train their mental math skills on their preferred Apple hardware.

### How often is Card Adder 21 updated?

The latest version, 1.3.6, was released on May 11, 2026. Future updates are planned to include Game Center high scores and personalized progress tracking.

### Does Card Adder 21 have ads?

No, Card Adder 21 does not contain advertisements. Ads are only shown on losing segments, making the core gameplay experience ad-free.

### What is the user rating for Card Adder 21?

Card Adder 21 has received a perfect rating of 5.0 stars from one user review, indicating high user satisfaction with the game's concept and execution.

### Can I track my progress in Card Adder 21?

Yes, the game includes progress tracking to help you monitor your improvement over time. Personalized progress tracking is also planned for future updates.

## Version history (last 5 releases)

### 1.3.7 — 2026-07-10

UI facelift! Pro (ad-free) lifetime upgrade now available! Bug fixes.

### 1.3.6 — 2026-05-11

UI facelift! Pro (ad-free) lifetime upgrade now available! Bug fixes.

### 1.3.5 — 2026-01-22

Pro (ad-free) lifetime upgrade now available! Bug fixes and UI updates.

### 1.3.4 — 2025-11-05

Pro (ad-free) lifetime upgrade now available!

### 1.3.3 — 2025-11-03

Pro (ad-free) lifetime upgrade now available!

## Apps similar to Card Adder 21

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Card Counter - KK Blackjack 21](https://appshunter.io/ios/app/card-counter-kk-blackjack-21/id1412661740) | 4.2 (9) | Free | Games |
| [Blackjack with Odds](https://appshunter.io/ios/app/blackjack-with-odds/id6470506973) | 4.7 (24) | Free | Games |
| [Blackjack Trainer and Analyzer](https://appshunter.io/ios/app/blackjack-trainer-and-analyzer/id6670712435) | 5.0 (1) | Free | Games |
| [Blackjack Strategy + Trainer](https://appshunter.io/ios/app/blackjack-strategy-plus-trainer/id6751148964) | 5.0 (3) | Free | Games |
| [Blackjack Solver](https://appshunter.io/ios/app/blackjack-solver/id6751151674) | 5.0 (5) | Free | Games |
| [Blackjack Advisor](https://appshunter.io/ios/app/blackjack-advisor/id6447469106) | 5.0 (4) | Free | Games |

## More apps by Dot Business Integrated Solutions

- [BLookup](https://appshunter.io/ios/app/blookup/id6744564137)
- [Visa Help](https://appshunter.io/ios/app/visa-help/id6747571892)
- [Bel Air Booking](https://appshunter.io/ios/app/bel-air-booking/id6756485321)
- [Album Arena](https://appshunter.io/ios/app/album-arena/id6757329427)
- [OnlyQuotes - Save quotes!](https://appshunter.io/ios/app/onlyquotes-save-quotes/id6762978482)

All apps by Dot Business Integrated Solutions: https://appshunter.io/developer/1808206089

## Related topics

[card adder 21](https://appshunter.io/ios/topics/card-adder-21)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-18.*