# Flash Mental Math vs Indigo Math Abacus for kids

The clearest difference is rating: Flash Mental Math at 4.6 against Indigo Math Abacus for kids's 2.0. Flash Mental Math also leads on review sentiment (100% vs 63%) and in-app purchases (none vs 3). Indigo Math Abacus for kids's advantage is update cadence (every 3 weeks vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Indigo Math Abacus for kids sells 3 in-app purchases, starting at $5.99 per month. Flash Mental Math asks for nothing beyond the download.

Flash Mental Math holds the better App Store score, 4.6 against 2.0. That said, the two scores are not equally well evidenced: Flash Mental Math has 20 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Flash Mental Math's written reviews are positive against 63% of Indigo Math Abacus for kids's.

Flash Mental Math ships an update every 3 months, Indigo Math Abacus for kids every 3 weeks. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Flash Mental Math | Indigo Math Abacus for kids |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (20 ratings)](https://appshunter.io/ios/app/flash-mental-math-simple/id1547944841/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/indigo-math-abacus-for-kids/id6450366535/reviews) |
| Number of ratings | **20** | 1 |
| Positive reviews | **100.0% of reviews** | 62.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 14 MB | 75 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ryouhei Azuma](https://appshunter.io/developer/1353297781) | [INDYGO MENTAL, TOV](https://appshunter.io/developer/1692935899) |

## 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


### Indigo Math Abacus for kids

[App page](https://appshunter.io/ios/app/indigo-math-abacus-for-kids/id6450366535)

This app offers interactive mental math and brain training for children. It uses gamified tasks and an abacus visualization to improve calculation speed, focus, and logical thinking. Designed to enhance mathematical intuition and academic performance.

**Highlights:** Mental calculations practice, Abacus (Soroban) visualization, Gamified learning tasks, Adjustable complexity levels, User-friendly interface, Improves focus and concentration

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month | $5.99 | per month |
| 3 months | $80.99 | per 3 months |
| year | $304.99 | per year |


## Frequently asked questions

### Is Flash Mental Math free?

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

### Is Indigo Math Abacus for kids free?

Indigo Math Abacus for kids is free to download, with in-app purchases available.

### Which has better reviews, Flash Mental Math or Indigo Math Abacus for kids?

Flash Mental Math is rated higher. Flash Mental Math averages 4.6 out of 5 from 20 ratings, while Indigo Math Abacus for kids averages 2.0 from 1 ratings.

### Do Flash Mental Math or Indigo Math Abacus for kids have ads?

Both Flash Mental Math and Indigo Math Abacus for kids show ads.

### Which is updated more often, Flash Mental Math or Indigo Math Abacus for kids?

Flash Mental Math ships an update every 3 months, and Indigo Math Abacus for kids every 3 weeks. Most recently, Flash Mental Math was updated on November 7, 2026 and Indigo Math Abacus for kids 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.*