# Flash Mental Math vs Abacus Lesson

The clearest difference is in-app purchases: Flash Mental Math at none against Abacus Lesson's 3. Abacus Lesson's advantage is update cadence (every 2 weeks vs every 3 months) and rating (5.0 vs 4.7). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Abacus Lesson sells 3 one-off in-app purchases. Flash Mental Math asks for nothing beyond the download.

Abacus Lesson holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 18 and 14 respectively.

Flash Mental Math ships an update every 3 months, Abacus Lesson every 2 weeks. The most recent releases landed on September 29, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Flash Mental Math | Abacus Lesson |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (18 ratings)](https://appshunter.io/ios/app/flash-mental-math-simple/id1547944841/reviews) | **[5.0 (14 ratings)](https://appshunter.io/ios/app/abacus-lesson-multiplication/id1582635868/reviews)** |
| Number of ratings | **18** | 14 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 14 MB | 138 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ryouhei Azuma](https://appshunter.io/developer/1353297781) | [Hirokazu Komatsu](https://appshunter.io/developer/1523833531) |

## What reviewers say

### Flash Mental Math

[App page](https://appshunter.io/ios/app/flash-mental-math-simple/id1547944841)

Practice mental arithmetic with various difficulty levels and custom modes. This app serves as a brain training tool to enhance calculation skills.

**Highlights:** Mental arithmetic practice, Easy, normal, and difficult modes, Customizable modes, Brain training, Calculation skill improvement

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Abacus Lesson

[App page](https://appshunter.io/ios/app/abacus-lesson-multiplication/id1582635868)

Learn multiplication using a virtual abacus. This app teaches a simple and fast method for calculating multiplication, emphasizing the mental calculation benefits of the abacus over digital calculators.

**Highlights:** Virtual abacus for multiplication, Simple and fast calculation methods, Focus on mental calculation skills, Step-by-step multiplication lessons, Suitable for beginners

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Donation Lv1 for hiding Ad | $1.99 | one-time |
| Donation Lv2 for hiding Ad | $3.99 | one-time |
| Donation Lv3 for hiding Ad | $8.99 | one-time |


## Frequently asked questions

### Is Flash Mental Math free?

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

### Is Abacus Lesson free?

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

### Which has better reviews, Flash Mental Math or Abacus Lesson?

Abacus Lesson is rated higher. Flash Mental Math averages 4.7 out of 5 from 18 ratings, while Abacus Lesson averages 5.0 from 14 ratings.

### Do Flash Mental Math or Abacus Lesson have ads?

Both Flash Mental Math and Abacus Lesson show ads.

### Which is updated more often, Flash Mental Math or Abacus Lesson?

Flash Mental Math ships an update every 3 months, and Abacus Lesson every 2 weeks. Most recently, Flash Mental Math was updated on September 29, 2026 and Abacus Lesson on October 8, 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.*