# Mental Arithmetic Math vs djaOS

The clearest difference is ads: djaOS at none against Mental Arithmetic Math's shown. Mental Arithmetic Math's advantage is iOS requirement (15.0 vs 26.2). On price, 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.

## The numbers

| Metric | Mental Arithmetic Math | djaOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (90 ratings)](https://appshunter.io/ios/app/mental-arithmetic-math/id1580847431/reviews)** | — |
| Number of ratings | **90** | — |
| Positive reviews | 90.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | — |
| Monetization | Ad-supported | — |
| Size | 105 MB | 2 MB |
| Requires iOS | **15.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Satoshi Konno](https://appshunter.io/developer/1565729374) | [iOne Sport Leisure & Tech](https://appshunter.io/developer/1397932121) |

## What reviewers say

### Mental Arithmetic Math

[App page](https://appshunter.io/ios/app/mental-arithmetic-math/id1580847431)

Engage in fun arithmetic challenges suitable for all ages. Improve your math skills and concentration with adjustable difficulty levels. Play solo or with friends, even offline, for a quick and enjoyable brain workout.

**Highlights:** Arithmetic challenges, Adjustable difficulty, Suitable for all ages, Play with friends, Offline play, Improves concentration

**Features:** macOS Compatibility

**In-app purchases:** none


### djaOS

[App page](https://appshunter.io/ios/app/djaos/id6757203945)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mental Arithmetic Math free?

Mental Arithmetic Math is free to download, with no in-app purchases.

### Is djaOS free?

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

### Do Mental Arithmetic Math or djaOS have ads?

Mental Arithmetic Math shows ads; djaOS does not.

---

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