# Calculator & abacus training vs Flash Mental Math

The clearest difference is rating: Flash Mental Math at 4.7 against Calculator & abacus training's 1.0. Flash Mental Math also leads on in-app purchases (none vs 1) and ratings volume (19 vs 1). Calculator & abacus training's advantage is iOS requirement (12.0 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Calculator & abacus training sells 1 one-off in-app purchase. Flash Mental Math asks for nothing beyond the download.

Flash Mental Math holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Flash Mental Math has 19 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 86% of Calculator & abacus training's written reviews are positive against 100% of Flash Mental Math's.

Calculator & abacus training ships an update every 2 months, Flash Mental Math every 3 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Calculator & abacus training | Flash Mental Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/calculator-and-abacus-training/id1092519812/reviews) | **[4.7 (19 ratings)](https://appshunter.io/ios/app/flash-mental-math-simple/id1547944841/reviews)** |
| Number of ratings | 1 | **19** |
| Positive reviews | 85.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 20 MB | 14 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [kenji kiuchi](https://appshunter.io/developer/553473005) | [Ryouhei Azuma](https://appshunter.io/developer/1353297781) |

## What reviewers say

### Calculator & abacus training

[App page](https://appshunter.io/ios/app/calculator-and-abacus-training/id1092519812)

Enhance your math skills with calculation drills for abacus and calculator. Customize training sessions for addition, subtraction, multiplication, and division, with advanced options available after purchase. Challenge yourself in a mode where problems increase in difficulty.

**Highlights:** Abacus and calculator training, Customizable training modes, Addition, subtraction, multiplication, division, Progress tracking, Challenge mode with increasing difficulty, Up to 5-digit calculations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ad & All function release | $9.99 | one-time |


### 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


## Frequently asked questions

### Is Calculator & abacus training free?

Calculator & abacus training is free to download, with in-app purchases available.

### Is Flash Mental Math free?

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

### Which has better reviews, Calculator & abacus training or Flash Mental Math?

Flash Mental Math is rated higher. Calculator & abacus training averages 1.0 out of 5 from 1 ratings, while Flash Mental Math averages 4.7 from 19 ratings.

### Do Calculator & abacus training or Flash Mental Math have ads?

Both Calculator & abacus training and Flash Mental Math show ads.

### Which is updated more often, Calculator & abacus training or Flash Mental Math?

Calculator & abacus training ships an update every 2 months, and Flash Mental Math every 3 months. Most recently, Calculator & abacus training was updated on November 2, 2026 and Flash Mental Math on November 3, 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.*