# CAJ文献阅读器 vs DeepFocus!

The clearest difference is update cadence: DeepFocus! at every 4 weeks against CAJ文献阅读器's every 4 months. CAJ文献阅读器's advantage is iOS requirement (12.0 vs 16.1). On price, ads, in-app purchases 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 and DeepFocus! sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

CAJ文献阅读器 ships an update every 4 months, DeepFocus! every 4 weeks. The most recent releases landed on October 9, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | CAJ文献阅读器 | DeepFocus! |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 65.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 weeks** |
| Monetization | Freemium | — |
| Size | 53 MB | 10 MB |
| Requires iOS | **12.0** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Meitian Trading](https://appshunter.io/developer/1549616114) | [志文 李](https://appshunter.io/developer/1852909959) |

## 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 |


### DeepFocus!

[App page](https://appshunter.io/ios/app/deepfocus/id6761233622)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Member | $2.99 | one-time |


## 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 DeepFocus! free?

DeepFocus! is free to download, with in-app purchases available.

### Do CAJ文献阅读器 or DeepFocus! have ads?

Neither CAJ文献阅读器 nor DeepFocus! shows ads.

### Which is updated more often, CAJ文献阅读器 or DeepFocus!?

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