# CAJ文献阅读器 vs 四季专注

The clearest difference is in-app purchases: 四季专注 at none against CAJ文献阅读器's 3. CAJ文献阅读器's advantage is iOS requirement (12.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. CAJ文献阅读器 sells 3 in-app purchases, starting at $2.99 per month. 四季专注 asks for nothing beyond the download.

## The numbers

| Metric | CAJ文献阅读器 | 四季专注 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 65.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | — |
| Monetization | Freemium | — |
| Size | 53 MB | 12 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Meitian Trading](https://appshunter.io/developer/1549616114) | [AIRGO LIMITED](https://appshunter.io/developer/1647133723) |

## What reviewers say

### CAJ文献阅读器

[App page](https://appshunter.io/ios/app/caj/id1669879414)

This app allows you to easily read and convert CAJ, NH, and KDH document formats, commonly used for academic papers from Chinese academic databases. It supports converting these files to PDF or Word, with OCR capabilities for text extraction from scanned images. You can also import files from messaging apps and manage your reading history.

**Highlights:** Read CAJ, NH, KDH formats, Convert CAJ to PDF, Convert CAJ to Word, OCR text recognition, Import from messaging apps, Reading history management

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月会员 | $2.99 | per month |
| 季会员 | $4.99 | per 3 months |
| 年会员 | $7.99 | per year |


### 四季专注

[App page](https://appshunter.io/ios/app/zen-seasons/id6757084611)

**In-app purchases:** none


## Frequently asked questions

### Is CAJ文献阅读器 free?

CAJ文献阅读器 is free to download, with in-app purchases available.

### Is 四季专注 free?

四季专注 is free to download, with no in-app purchases.

### Do CAJ文献阅读器 or 四季专注 have ads?

Neither CAJ文献阅读器 nor 四季专注 shows ads.

---

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