# 教你炒股票108课 vs PDF Reader

The clearest difference is update cadence: PDF Reader at every 3 weeks against 教你炒股票108课's every 6 months. 教你炒股票108课's advantage is review sentiment (100% vs 71%) and iOS requirement (9.0 vs 12.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. 教你炒股票108课 sells 1 one-off in-app purchase and PDF Reader sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

教你炒股票108课 ships an update every 6 months, PDF Reader every 3 weeks. The most recent releases landed on September 7, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | 教你炒股票108课 | PDF Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (8 ratings)](https://appshunter.io/ios/app/pdf-reader-mini-version/id898564035/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | **100.0% of reviews** | 71.4% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 274 MB | 50 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [红 陈](https://appshunter.io/developer/1089407168) | [绪强 任](https://appshunter.io/developer/898564038) |

## What reviewers say

### 教你炒股票108课

[App page](https://appshunter.io/ios/app/108/id651284855)

This app provides access to the original teachings of Chan Theory, a comprehensive stock market analysis method. It emphasizes direct study of the author's work and practical application for mastering the theory and achieving profitability.

**Highlights:** Original Chan Theory content, Stock selection principles, Market analysis techniques, Practical application guidance, Historical market predictions

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 所有语音 | $3.99 | one-time |


### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-mini-version/id898564035)

This app allows you to read various document formats like PDF, EPUB, and CHM on your iPhone and iPad. It supports file import, text search, annotation, and even previewing MS Office files and videos. A simple to-do list and auto-save reading progress are also included.

**Highlights:** Reads PDF, CHM, EPUB, TXT files, PDF annotation and text search, File import via Files, Airdrop, iTunes, web, MS Office and video file preview, Simple To-Do list functionality, Auto-save reading progress

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reader App donate | $0.99 | one-time |
| Dropbox Support | $0.99 | one-time |
| Remove Ad | $4.99 | one-time |
| Todo donate | $7.99 | one-time |
| Todo donate | $14.99 | one-time |


## Frequently asked questions

### Is 教你炒股票108课 free?

教你炒股票108课 is free to download, with in-app purchases available.

### Is PDF Reader free?

PDF Reader is free to download, with in-app purchases available.

### Do 教你炒股票108课 or PDF Reader have ads?

Neither 教你炒股票108课 nor PDF Reader shows ads.

### Which is updated more often, 教你炒股票108课 or PDF Reader?

教你炒股票108课 ships an update every 6 months, and PDF Reader every 3 weeks. Most recently, 教你炒股票108课 was updated on September 7, 2026 and PDF Reader on September 25, 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.*