# GUGA vs CAJ阅读器

GUGA and CAJ阅读器 both sit at 4.7 stars, but that hides the real split: 70% of GUGA's written reviews are positive against 0% of CAJ阅读器's. GUGA also leads on ratings volume (163 vs 10) and update cadence (every 4 days vs every 11 days). CAJ阅读器's advantage is iOS requirement (11.0 vs 15.0). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. GUGA sells 3 one-off in-app purchases and CAJ阅读器 sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for GUGA against 4.6 for CAJ阅读器. That said, the two scores are not equally well evidenced: GUGA has 163 ratings behind it against 10, so its average is the more settled of the two. Written reviews are what separate them: 70% of GUGA's written reviews are positive against 0% of CAJ阅读器's.

GUGA ships an update every 4 days, CAJ阅读器 every 11 days. The most recent releases landed on October 16, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | GUGA | CAJ阅读器 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (163 ratings)](https://appshunter.io/ios/app/guga-hyperboard/id1619055819/reviews)** | [4.6 (10 ratings)](https://appshunter.io/ios/app/caj-caj/id6447676025/reviews) |
| Number of ratings | **163** | 10 |
| Positive reviews | **70.2% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 11 days |
| Monetization | Free with in-app purchases | Freemium |
| Size | 705 MB | 45 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GutenbergGalaxy Technology Co.](https://appshunter.io/developer/1592037946) | [Light Speed Intelligence Technology Co., Ltd.](https://appshunter.io/developer/1670291399) |

## What reviewers say

### GUGA

[App page](https://appshunter.io/ios/app/guga-hyperboard/id1619055819)

This app combines notebook, whiteboard, and card functionalities for diverse learning needs. It allows for importing various formats, multi-layer handwriting, and creating interconnected learning materials. Share your progress and access cross-device data with ease.

**Highlights:** Import various notebook formats, Multi-layer handwriting support, Create and link cards, Multi-level whiteboard functionality, Cross-device data sharing, Community sharing platform

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Limited-time Discount C | $4.99 | one-time |
| Limited-time Discount B | $6.99 | one-time |
| Unlock GUGA PRO | $9.99 | one-time |

**What reviewers like**

- 👍 User-friendly interface
- 💡 Handwriting search capability
- 🌟 Good for note-taking and studying
- 🎨 Beautiful app design
- ✍️ Natural pen strokes

**What reviewers complain about**

- 🐛 Pencil direction not rotating
- 🐛 Terms and Privacy Policy not accessible
- 🐛 Cannot log in
- 🐛 iCloud sync glitchy
- 🐛 Notes erased when switching devices

**Reported bugs**

- Pencil direction does not rotate with pencil movement
- Cannot check Terms and Privacy Policy on first app open
- Cannot log in
- iCloud sync is glitchy
- Notes get erased when switching devices

**Requested features**

- Allow Apple Pencil to transition to previous tool
- Adapt to Apple Pencil Pro squeeze gesture
- Return to previous PDF card viewing mode
- Allow Mac OS version with iCloud syncing
- Add auto backup to other cloud drives (Google Drive, OneDrive)


### CAJ阅读器

[App page](https://appshunter.io/ios/app/caj-caj/id6447676025)

This app is a professional reader for CAJ documents, supporting academic papers, journals, and magazines. It also offers conversion tools to transform CAJ files into Word or PDF, and handles various PDF format conversions with other office documents.

**Highlights:** CAJ document viewing, CAJ to Word conversion, CAJ to PDF conversion, PDF to Office file conversion, Supports academic papers and journals

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月会员 | $2.99 | per month |
| 年会员 | $12.99 | per year |
| 永久会员 | $14.99 | one-time |


## Frequently asked questions

### Is GUGA free?

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

### Is CAJ阅读器 free?

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

### Which has better reviews, GUGA or CAJ阅读器?

GUGA is rated higher. GUGA averages 4.7 out of 5 from 163 ratings, while CAJ阅读器 averages 4.6 from 10 ratings.

### Do GUGA or CAJ阅读器 have ads?

Neither GUGA nor CAJ阅读器 shows ads.

### Which is updated more often, GUGA or CAJ阅读器?

GUGA ships an update every 4 days, and CAJ阅读器 every 11 days. Most recently, GUGA was updated on October 16, 2026 and CAJ阅读器 on October 5, 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.*