# Flash Mental Math vs Abacus Lesson

The clearest difference is in-app purchases: Flash Mental Math at none against Abacus Lesson's 1. Abacus Lesson's advantage is ads (none vs shown) and update cadence (every 2 days vs every 3 months). On price, rating and device support there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.7 for Flash Mental Math against 4.8 for Abacus Lesson. That said, the two scores are not equally well evidenced: Abacus Lesson has 95 ratings behind it against 18, so its average is the more settled of the two.

Flash Mental Math ships an update every 3 months, Abacus Lesson every 2 days. The most recent releases landed on August 3, 2026 and September 21, 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) | **[4.8 (95 ratings)](https://appshunter.io/ios/app/abacus-lesson/id1596053232/reviews)** |
| Number of ratings | 18 | **95** |
| Positive reviews | — | 75.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 2 days** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 14 MB | 153 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/id1596053232)

Master mental arithmetic and abacus calculation with this comprehensive app. Learn efficient finger movements and mental math techniques to solve complex problems quickly. Enjoy a customizable and ad-free learning experience with progress tracking.

**Highlights:** Abacus lessons, Mental arithmetic training, Finger movement focus, Customizable abacus color, Screen orientation options, Trophy system for goals

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all contents | $5.99 | 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 4.8 from 95 ratings.

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

Flash Mental Math shows ads; Abacus Lesson does not.

### 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 days. Most recently, Flash Mental Math was updated on August 3, 2026 and Abacus Lesson 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.*