# Know Abacus vs Mental Arithmetic Math

The clearest difference is in-app purchases: Mental Arithmetic Math at none against Know Abacus's 1. Know Abacus's advantage is rating (4.7 vs 4.4) and iOS requirement (11.0 vs 15.0). On price, review sentiment, ratings volume and update cadence there is nothing between them.

Both are free to download. Know Abacus sells 1 one-off in-app purchase. Mental Arithmetic Math asks for nothing beyond the download.

Know Abacus holds the better App Store score, 4.7 against 4.4. Both are backed by a comparable volume of ratings — 67 and 90 respectively. Written reviews point the same way: 96% of Know Abacus's written reviews are positive against 90% of Mental Arithmetic Math's.

Both ship on a similar rhythm, roughly every 2 months. Both last shipped on October 15, 2026.

## The numbers

| Metric | Know Abacus | Mental Arithmetic Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (67 ratings)](https://appshunter.io/ios/app/know-abacus/id641867438/reviews)** | [4.4 (90 ratings)](https://appshunter.io/ios/app/mental-arithmetic-math/id1580847431/reviews) |
| Number of ratings | 67 | **90** |
| Positive reviews | **96.4% of reviews** | 90.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 28 MB | 105 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kittipong Mungnirun](https://appshunter.io/developer/488058533) | [Satoshi Konno](https://appshunter.io/developer/1565729374) |

## What reviewers say

### Know Abacus

[App page](https://appshunter.io/ios/app/know-abacus/id641867438)

This app teaches children how to use an abacus for various math operations. It covers counting, addition, subtraction, multiplication, and division, helping to develop their mathematical abilities and brain potential. It offers multiple learning modes and customization options.

**Highlights:** Abacus counting, Addition and subtraction (1 & 2 digits), Multiplication and division (1-2 digits), Mental math practice, Review and random lessons, Customizable abacus (color, touch), Multiple languages

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### 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


## Frequently asked questions

### Is Know Abacus free?

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

### Is Mental Arithmetic Math free?

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

### Which has better reviews, Know Abacus or Mental Arithmetic Math?

Know Abacus is rated higher. Know Abacus averages 4.7 out of 5 from 67 ratings, while Mental Arithmetic Math averages 4.4 from 90 ratings.

### Do Know Abacus or Mental Arithmetic Math have ads?

Both Know Abacus and Mental Arithmetic Math show ads.

### Which is updated more often, Know Abacus or Mental Arithmetic Math?

Know Abacus ships an update every 2 months, and Mental Arithmetic Math every 2 months. Most recently, Know Abacus was updated on October 15, 2026 and Mental Arithmetic Math on October 15, 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.*