GUGA vs CAJ阅读器
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GUGA
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.
- Import various notebook formats
- Multi-layer handwriting support
- Create and link cards
- Multi-level whiteboard functionality
- Cross-device data sharing
- Community sharing platform
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GUGA is a hyper learning tool that can meet your learning needs in different scenarios. “Notebook”, “Whiteboard” and “Cards” are the three most important functions of GUGA. In addition, GUGA also provides users with a community-SharePlace to share learning data; and provides a "Inspiration Shorthand" function to send data and record information across devices; and GUGA also provides a large number of shortcuts for you to use after connecting to the keyboard mouse. The “Notebook” is the most common learning material and the most basic learning scenario. GUGA's notebook: 1. Not only other notebook software, but also support a variety of formats to be imported into notebooks, create new notebooks, add/reduce pages, provide more than 100 inner pages and cover templates, DIY outline catalogues, edit page jumps, import pictures/text, etc. 2. It also supports adding an unlimited number of handwriting layers to each page of the notebook, hiding/displaying/merging handwriting layers, which is convenient for brushing questions and other uses when learning. And, 3. You can also long press to select the content on the notebook to mark/excerpt while writing and taking notes, and make cards for other uses based on the excerpt content. The “Whiteboard” is a multi-data learning console and a richer learning scenario. GUGA's whiteboard: 1. Support the import of multiple notebooks and use them in one whiteboard at the same time. You can also add/import data in other formats to learn and use them together. 2. Provide a notebook floating window system, which makes it more convenient for you to use multiple notebooks and whiteboards at the same time. The notebook in the whiteboard can be presented in the form of a floating window. The floating window has a variety of states (maximizing/mini window/up and down left and right side windows), which can hide/close/display all floating windows with one click; support floating window memory, type again Open the whiteboard, and all floating windows that are not closed can continue to be used. 3 Provide the "multi-level" whiteboard function. The whiteboard can create a lower-layer whiteboard, or it can be connected with other whiteboards to form a link relationship, thus creating a relationship between learning scenes. 4 You can copy the selected content in the floating notebook to the whiteboard to form a card. The cards on the whiteboard can be freely combined and split, and the cards can also be connected to form a brain map; the jump relationship can be set between the cards. 5 The whiteboard can be divided by frame, and it can also be positioned with pins to make it easier to use and manage the whiteboard content. In addition, 6 The entire whiteboard can be emitted as pdf, and the frame can also be emitted as a multi-page PDF, and the jump relationship between the frames will also be retained. The card is the achievement of atomization learning, and the card package is the collection of your achievements. GUGA's card: 1. Excerpt cards in the notebook and cards on the whiteboard can be collected in the card package. 2. You can use the "Inspiration Catcher" function of the GUGA WeChat official account/browser's GUGA plug-in to transfer the information you want to save to any of your card package at any time. 3. Each card is a "blocked" rich text editor, which can be combined and split on the whiteboard, or any block can be set as an answer block in flash card mode. 4. Card packs can be converted between ordinary packs and flash card packs; the function of flash card packs is consistent with other flash card software (Anki). 5. Each flash card pack can choose different learning modes and different memory algorithms to help you better learn and review cards. In addition, 6. The daily learning plan of flash cards will automatically appear in the GUGA log (My Logbook) on the right to learn flash card packages at any time. Have Fun with GUGA 2.0, and Enjoy Your Serious Learning Power.
CAJ阅读器
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.
- CAJ document viewing
- CAJ to Word conversion
- CAJ to PDF conversion
- PDF to Office file conversion
- Supports academic papers and journals
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CAJ全文浏览阅读器! 专业CAJ文档阅读器,可用于报刊、文献、杂志、论文等的阅读软件。 还支持caj格式转换,快速将CAJ转成Word、CAJ转成PDF; 还支持PDF格式转换,支持多种PDF格式与word、excel、ppt等文件格式互转。 会员订阅: 订阅价格为每年88元、每月18元,免费试用3天,到期自动续费。 订阅会自动续订,除非在当前期间结束前至少24小时关闭自动续订;帐户将在当前期间结束前24小时内收取续订费用,并确定续订费用 订阅可以由用户管理,并且可以在购买后转到用户的AppStore帐户设置来关闭自动续订 隐私条款:https://blog.csdn.net/m0_74390048/article/details/130128465 使用条款:https://blog.csdn.net/m0_74390048/article/details/130128542
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | GUGA | CAJ阅读器 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (163 ratings) — better | 4.6 (10 ratings) |
| Positive reviews | 70.2% of reviews — better | 0.0% of reviews |
| Number of ratings | 163 — better | 10 |
| Update frequency | Every 4 days — better | Every 11 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 705 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | GutenbergGalaxy Technology Co. | Light Speed Intelligence Technology Co., Ltd. |
Customer experience
GUGA
CAJ阅读器
Bugs and requests
GUGA
Reported bugs
31 issues- 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
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- All notes disappeared after not using for half a year
- Lost purchase and notes after re-login
- Cannot convert to flashcards or use mind map
- PDF viewing mode changed in version 2.0
- PDF cards open in a very small window
- Cannot view PDF in split-screen mode
- Handwritten notes on imported PDFs lost after automatic update
- Lasso tool gets stuck when moving objects
- Frequent crashes when using two-finger undo function
- Developers not responsive to English customers
- Two-finger undo is clumsy and often undoes too many steps
- Drawing a line from outside an image to inside adds points that cannot be removed by eraser
- Cannot edit curvature of drawn curves
- Lag when using ruler and pasting images
- Notes sometimes disappear and are hard to find
- Whiteboard viewing feature not yet released
- Pasting URLs no longer shows preview images
- App is laggy after update, especially when moving cards
- Cannot login with Apple account
- PDF export quality is blurry (exported as image/screenshot)
- Cannot delete pen stroke colors
- iCloud syncing is slow
- Handwriting search failed
- Card excerpt from PDF does not direct back to its location in PDF
- Vertical videos become horizontal with black bars
- Added fonts are not usable
Requested features
24 requests- 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)
Show 19 moreShow fewer
- Add backlinking feature
- Speedy, glitchless movement of cards
- Faster UI
- Ability to zoom with mouse scroll wheel
- Add presentation mode with set paths
- iPhone and iMac versions for syncing
- Add folder functionality for whiteboard organization
- Allow modification of pen stroke color with lasso tool
- Allow deletion of pen stroke colors
- Improve PDF export quality to vector quality
- Export whole canvas as PDF without limitation
- Allow adding more fonts
- Improve URL link preview functionality
- Allow inputting numbers to adjust pen size
- Allow editing curve curvature
- Fix issue with drawing lines from outside to inside images
- Fix issue with two-finger undo
- Allow users to see remaining free trial count
- Allow sign in with Google
CAJ阅读器
Not enough reviews yet to summarise bugs or requests.
In-app purchases
GUGA
- Limited-time Discount C$4.99
- Limited-time Discount B$6.99
- Unlock GUGA PRO$9.99
CAJ阅读器
- 月会员3 Days trial$2.991 Month
- 年会员3 Days trial$12.991 Year
- 永久会员$14.99









