# Know Abacus vs Mental Abacus Expert

The clearest difference is review sentiment: Know Abacus at 96% against Mental Abacus Expert's 50%. Know Abacus also leads on rating (4.7 vs 4.1) and ratings volume (67 vs 7). Mental Abacus Expert's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price and device support there is nothing between them.

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

Know Abacus holds the better App Store score, 4.7 against 4.1. That said, the two scores are not equally well evidenced: Know Abacus has 67 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 96% of Know Abacus's written reviews are positive against 50% of Mental Abacus Expert's.

Know Abacus ships an update every 2 months, Mental Abacus Expert every 3 weeks. The most recent releases landed on July 6, 2026 and June 10, 2026 respectively.

## The numbers

| Metric | Know Abacus | Mental Abacus Expert |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (67 ratings)](https://appshunter.io/ios/app/know-abacus/id641867438/reviews)** | [4.1 (7 ratings)](https://appshunter.io/ios/app/mental-abacus-expert/id835952830/reviews) |
| Number of ratings | **67** | 7 |
| Positive reviews | **96.4% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 28 MB | 26 MB |
| Requires iOS | 11.0 | **7.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kittipong Mungnirun](https://appshunter.io/developer/488058533) | [Lindbla Las och Skrivutveckling AB](https://appshunter.io/developer/835952833) |

## 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 Abacus Expert

[App page](https://appshunter.io/ios/app/mental-abacus-expert/id835952830)

Enhance your mental arithmetic abilities with this app that utilizes abacus-based exercises. Improve concentration and working memory through four distinct training modules designed to build mental calculation skills.

**Highlights:** Four abacus-based arithmetic exercises, Develops concentration and working memory, Practice mental abacus technique, Modern (4+1) or classic (5+2) abacus types, Text and video instructions, Built-in speech engine, Beginner and expert modes

**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 Abacus Expert free?

Mental Abacus Expert is free to download, with no in-app purchases.

### Which has better reviews, Know Abacus or Mental Abacus Expert?

Know Abacus is rated higher. Know Abacus averages 4.7 out of 5 from 67 ratings, while Mental Abacus Expert averages 4.1 from 7 ratings.

### Do Know Abacus or Mental Abacus Expert have ads?

Know Abacus shows ads; Mental Abacus Expert does not.

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

Know Abacus ships an update every 2 months, and Mental Abacus Expert every 3 weeks. Most recently, Know Abacus was updated on July 6, 2026 and Mental Abacus Expert on June 10, 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.*