# Abacus Practice vs Synth Brain

The clearest difference is price: Abacus Practice at $0.99 against Synth Brain's $14.99. Synth Brain's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Abacus Practice costs $0.99 and Synth Brain $14.99 up front. Abacus Practice sells 1 one-off in-app purchase. Synth Brain asks for nothing beyond the download.

## The numbers

| Metric | Abacus Practice | Synth Brain |
| --- | --- | --- |
| Price | **$0.99** | $14.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 18 MB | 6 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SMART BIT K.K](https://appshunter.io/developer/1896559487) | [Code and DESIGN inc.](https://appshunter.io/developer/1172903960) |

## 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アンロック | $2.99 | one-time |


### Synth Brain

[App page](https://appshunter.io/ios/app/synth-brain-learn-synthesis/id6799208817)

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

**In-app purchases:** none


## Frequently asked questions

### Is Abacus Practice free?

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

### Is Synth Brain free?

Synth Brain costs $14.99, with no in-app purchases.

### Do Abacus Practice or Synth Brain have ads?

Neither Abacus Practice nor Synth Brain shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*