# Abacus Practice vs 脳内そろばん

The clearest difference is price: 脳内そろばん at Free against Abacus Practice's $0.99. 脳内そろばん also leads on update cadence (monthly vs every 4 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

脳内そろばん is free to download; Abacus Practice costs $0.99 up front. Abacus Practice sells 1 one-off in-app purchase and 脳内そろばん sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Abacus Practice ships an update every 4 months, 脳内そろばん monthly. The most recent releases landed on October 25, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Abacus Practice | 脳内そろばん |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 18 MB | 5 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [SMART BIT K.K](https://appshunter.io/developer/1896559487) | [Ryo Sato](https://appshunter.io/developer/1831657696) |

## What reviewers say

### Abacus Practice

[App page](https://appshunter.io/ios/app/abacus-practice-mental-math/id6770438521)

Practice abacus, mental arithmetic, and calculation skills on your iPhone or iPad. Features a realistic abacus interface for various exercises, including addition, subtraction, multiplication, division, and flash calculations. Track your progress and review your performance over time.

**Highlights:** Realistic abacus interface, Practice addition, subtraction, multiplication, division, Flash and slip calculations, Customizable problem generation, Practice history and performance records, Adjustable settings for sound, vibration, and left-handed mode

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |


### 脳内そろばん

[App page](https://appshunter.io/ios/app/id6790279857)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム | $3.99 | one-time |


## Frequently asked questions

### Is Abacus Practice free?

Abacus Practice costs $0.99, and also offers in-app purchases.

### Is 脳内そろばん free?

脳内そろばん is free to download, with in-app purchases available.

### Do Abacus Practice or 脳内そろばん have ads?

Neither Abacus Practice nor 脳内そろばん shows ads.

### Which is updated more often, Abacus Practice or 脳内そろばん?

Abacus Practice ships an update every 4 months, and 脳内そろばん monthly. Most recently, Abacus Practice was updated on October 25, 2026 and 脳内そろばん on October 23, 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.*