# 單手學 vs 鴨鴨八字

The clearest difference is update cadence: 單手學 at every 4 days against 鴨鴨八字's every 2 weeks. 單手學 also leads on device support (3 vs 1) and iOS requirement (14.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. 單手學 sells 3 one-off in-app purchases and 鴨鴨八字 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

單手學 ships an update every 4 days, 鴨鴨八字 every 2 weeks. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 單手學 | 鴨鴨八字 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ipas-ai/id6756558415/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 153 MB | 59 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Seaberry Studio](https://appshunter.io/developer/308519884) | [Szuyao Lin](https://appshunter.io/developer/6788637279) |

## What reviewers say

### 單手學

[App page](https://appshunter.io/ios/app/ipas-ai/id6756558415)

Prepare for the iPAS AI Application Planner certification with this comprehensive study tool. It offers in-depth electronic books and over 4,000 practice questions, designed for efficient one-handed mobile use. Master AI concepts and pass your exam with confidence.

**Highlights:** 8 professional e-books covering AI topics, Over 4,000 practice questions, Simulated exams and past papers, One-handed operation design, Vertical and horizontal screen switching, Covers beginner and intermediate levels

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 初級通行證 | $4.99 | one-time |
| 中級通行證 | $7.99 | one-time |
| 全部通行證 | $9.99 | one-time |


### 鴨鴨八字

[App page](https://appshunter.io/ios/app/id6798153196)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 解鎖完整版 | $19.99 | one-time |


## Frequently asked questions

### Is 單手學 free?

單手學 is free to download, with in-app purchases available.

### Is 鴨鴨八字 free?

鴨鴨八字 is free to download, with in-app purchases available.

### Do 單手學 or 鴨鴨八字 have ads?

Neither 單手學 nor 鴨鴨八字 shows ads.

### Which is updated more often, 單手學 or 鴨鴨八字?

單手學 ships an update every 4 days, and 鴨鴨八字 every 2 weeks. Most recently, 單手學 was updated on October 30, 2026 and 鴨鴨八字 on October 31, 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.*