# 民达OA vs CAJ文献阅读器

The clearest difference is in-app purchases: 民达OA at none against CAJ文献阅读器's 3. 民达OA also leads on update cadence (every 2 weeks vs every 4 months). On price, ads, device support and iOS requirement 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. 民达OA asks for nothing beyond the download.

民达OA ships an update every 2 weeks, CAJ文献阅读器 every 4 months. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | 民达OA | CAJ文献阅读器 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 65.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 4 months |
| Monetization | — | Freemium |
| Size | 58 MB | 53 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hunan Minda Pharmaceutical Co., Ltd.](https://appshunter.io/developer/1535162701) | [Meitian Trading](https://appshunter.io/developer/1549616114) |

## What reviewers say

### 民达OA

[App page](https://appshunter.io/ios/app/oa/id1635309469)

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is 民达OA free?

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

### Is CAJ文献阅读器 free?

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

### Do 民达OA or CAJ文献阅读器 have ads?

Neither 民达OA nor CAJ文献阅读器 shows ads.

### Which is updated more often, 民达OA or CAJ文献阅读器?

民达OA ships an update every 2 weeks, and CAJ文献阅读器 every 4 months. Most recently, 民达OA was updated on October 7, 2026 and CAJ文献阅读器 on October 9, 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.*