# 腦珠算(加減法) 題目練習 vs 知識庫

The clearest difference is price: 知識庫 at Free against 腦珠算(加減法) 題目練習's $4.99. 知識庫 also leads on update cadence (every 6 weeks vs every 32 months). 腦珠算(加減法) 題目練習's advantage is iOS requirement (8.0 vs 12.0). On ads, in-app purchases and device support there is nothing between them.

知識庫 is free to download; 腦珠算(加減法) 題目練習 costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

腦珠算(加減法) 題目練習 ships an update every 32 months, 知識庫 every 6 weeks. Both last shipped on September 21, 2026.

## The numbers

| Metric | 腦珠算(加減法) 題目練習 | 知識庫 |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/id1419936734/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 32 months | **Every 6 weeks** |
| Monetization | Paid | — |
| Size | 9 MB | 19 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hamster Force Multimedia Ltd.](https://appshunter.io/developer/443416476) | [Dreamware Limited](https://appshunter.io/developer/892413586) |

## What reviewers say

### 腦珠算(加減法) 題目練習

[App page](https://appshunter.io/ios/app/id1419936734)

This app offers a comprehensive abacus mental arithmetic training tool with six essential practice types. Users can create custom practice sessions, generate random questions and answers, and export them as PDFs for offline use. It tracks progress and provides analysis to help users focus on their weak areas.

**Highlights:** Six abacus mental arithmetic practice types, Customizable random question generation, PDF export for offline practice, Detailed progress tracking and analysis, Practice and Challenge modes, Test paper editor

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

**In-app purchases:** none


### 知識庫

[App page](https://appshunter.io/ios/app/id6717610193)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 腦珠算(加減法) 題目練習 free?

腦珠算(加減法) 題目練習 costs $4.99, with no in-app purchases.

### Is 知識庫 free?

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

### Do 腦珠算(加減法) 題目練習 or 知識庫 have ads?

Neither 腦珠算(加減法) 題目練習 nor 知識庫 shows ads.

### Which is updated more often, 腦珠算(加減法) 題目練習 or 知識庫?

腦珠算(加減法) 題目練習 ships an update every 32 months, and 知識庫 every 6 weeks. Most recently, 腦珠算(加減法) 題目練習 was updated on September 21, 2026 and 知識庫 on September 21, 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.*