# Abacus Mental Math Training vs FractionAndProbability

The clearest difference is in-app purchases: FractionAndProbability at none against Abacus Mental Math Training's 1. FractionAndProbability also leads on update cadence (every 2 days vs monthly). Abacus Mental Math Training's advantage is iOS requirement (10.0 vs 16.6). On price, ads and device support there is nothing between them.

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

Abacus Mental Math Training ships an update monthly, FractionAndProbability every 2 days. The most recent releases landed on October 11, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Abacus Mental Math Training | FractionAndProbability |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (31 ratings)](https://appshunter.io/ios/app/abacus-mental-math-training/id6449295111/reviews)** | — |
| Number of ratings | **31** | — |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 34 MB | 3 MB |
| Requires iOS | **10.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Peikun Duan](https://appshunter.io/developer/1240254007) | [Katsuhiko Yao](https://appshunter.io/developer/1543188534) |

## What reviewers say

### Abacus Mental Math Training

[App page](https://appshunter.io/ios/app/abacus-mental-math-training/id6449295111)

This app offers professional training and assessment for abacus mental calculation and flash calculation, adhering to international grading standards. It features challenge and custom modes to help users improve their math and speed calculation skills.

**Highlights:** Adheres to World Abacus Mental Calculation Federation standards, Challenge Mode with 10 levels and 200 stages, Custom Mode for Flash Calculation and Abacus practice, Adjustable calculation parameters (number range, digits, time), Gradual difficulty progression, Simulates exam conditions

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.59 | one-time |


### FractionAndProbability

[App page](https://appshunter.io/ios/app/fractionandprobability/id6742116020)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Abacus Mental Math Training free?

Abacus Mental Math Training is free to download, with in-app purchases available.

### Is FractionAndProbability free?

FractionAndProbability is free to download, with no in-app purchases.

### Do Abacus Mental Math Training or FractionAndProbability have ads?

Both Abacus Mental Math Training and FractionAndProbability show ads.

### Which is updated more often, Abacus Mental Math Training or FractionAndProbability?

Abacus Mental Math Training ships an update monthly, and FractionAndProbability every 2 days. Most recently, Abacus Mental Math Training was updated on October 11, 2026 and FractionAndProbability on October 4, 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.*