# NumJam vs Concentration Game

The clearest difference is update cadence: NumJam at every 6 days against Concentration Game's every 5 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

NumJam ships an update every 6 days, Concentration Game every 5 months. The most recent releases landed on May 16, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | NumJam | Concentration Game |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (14 ratings)](https://appshunter.io/ios/app/concentration-game-solo/id1616382609/reviews)** |
| Number of ratings | — | **14** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 6 days** | Every 5 months |
| Monetization | — | Ad-supported |
| Size | 98 MB | 103 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oneiric Gaming Private Limited](https://appshunter.io/developer/1537581074) | [Hirokazu Uno](https://appshunter.io/developer/1570016990) |

## What reviewers say

### NumJam

[App page](https://appshunter.io/ios/app/numjam/id1589439853)

**Features:** macOS Compatibility

**In-app purchases:** none


### Concentration Game

[App page](https://appshunter.io/ios/app/concentration-game-solo/id1616382609)

A classic single-player card game where you match pairs of numbers. The challenge increases with a decreasing time limit as you advance through levels. Enjoy a brain-training experience with this solo card game.

**Highlights:** Single-player card game, Match numbered pairs, Time limit decreases with level, Brain training, Classic card game mechanics

**In-app purchases:** none


## Frequently asked questions

### Is NumJam free?

NumJam is free to download, with no in-app purchases.

### Is Concentration Game free?

Concentration Game is free to download, with no in-app purchases.

### Do NumJam or Concentration Game have ads?

Both NumJam and Concentration Game show ads.

### Which is updated more often, NumJam or Concentration Game?

NumJam ships an update every 6 days, and Concentration Game every 5 months. Most recently, NumJam was updated on May 16, 2026 and Concentration Game on September 21, 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.*