# MarginNote 4 vs 判別式電卓

The clearest difference is price: MarginNote 4 at Free against 判別式電卓's $0.49. 判別式電卓's advantage is in-app purchases (none vs 13) and iOS requirement (12.0 vs 17.0). On ads and device support there is nothing between them.

MarginNote 4 is free to download; 判別式電卓 costs $0.49 up front. MarginNote 4 sells 12 in-app purchases, starting at $1.99 per month. 判別式電卓 asks for nothing beyond the download.

## The numbers

| Metric | MarginNote 4 | 判別式電卓 |
| --- | --- | --- |
| Price | **Free** | $0.49 |
| Rating | **[4.5 (736 ratings)](https://appshunter.io/ios/app/marginnote-4-ai-notesmindmap/id1531657269/reviews)** | — |
| Number of ratings | **736** | — |
| Positive reviews | 58.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | — |
| Monetization | Free with in-app purchases | — |
| Size | 330 MB | 27 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Beijing Yunsi Software Technology Co., Ltd](https://appshunter.io/developer/723205556) | [kotobaz](https://appshunter.io/developer/1634727152) |

## What reviewers say

### MarginNote 4

[App page](https://appshunter.io/ios/app/marginnote-4-ai-notesmindmap/id1531657269)

This app integrates reading, note-taking, mind mapping, and flashcards into a unified study environment. It supports active learning with features like study sets, book compilation, and dual-article views. Enhance your understanding with visual learning tools and AI-powered content extraction for long-term memory retention.

**Highlights:** Integrated reading, note-taking, mind mapping, and flashcards, Quick Extend Note and Handwriting Layers for annotation, Study Set for organizing PDFs, EPUBs, videos, and audio, Mind Map and Concept Diagram for visual learning, AI Content Detection for formula and chart extraction, FSRS spaced-repetition algorithm for reviews, iCloud sync across Apple devices

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

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Subscription to MAX (Monthly) | $1.99 | per month |
| Subscription to MAX (3 months) | $4.99 | per 3 months |
| Subscription to MAX (6 months) | $7.99 | per 6 months |
| Subscription to MAX (Annually) | $12.99 | per year |
| MarginNote Max Annual | $16.99 | per year |
| 14 days Free Trial | Free | one-time |
| Upgrade to PRO from MN3(iOS) | $4.99 | one-time |
| Unlock PRO Forever (New) | $12.99 | one-time |
| Upgrade to MAX from MN3(macOS) | $19.99 | one-time |
| Unlock MAX based on PRO | $39.99 | one-time |
| Unlock MAX based on PRO (New) | $40.00 | one-time |
| Unlock MAX Forever (New) | $51.99 | one-time |

**What reviewers like**

- 🚀 Powerful features
- 📚 Great for academic/research use
- 👍 Useful note-taking and organization
- 🖊️ Improved handwriting and annotation

**What reviewers complain about**

- 🐛 Buggy and crashes frequently
- 🕰️ Slow and laggy sync between devices
- 🤯 Steep learning curve, poor documentation
- 💰 Expensive upgrade from previous version

**Reported bugs**

- Disappearing annotations when using extend function
- Inability to restore accidentally deleted mind maps
- Inconsistent behavior with PDF file management

**Requested features**

- Improved iCloud/cloud sync reliability
- More intuitive and user-friendly interface
- Better support for external document libraries
- Ability to disable auto-excerpt selection


### 判別式電卓

[App page](https://appshunter.io/ios/app/large-d/id6502815209)

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

**In-app purchases:** none


## Frequently asked questions

### Is MarginNote 4 free?

MarginNote 4 is free to download, with in-app purchases available.

### Is 判別式電卓 free?

判別式電卓 costs $0.49, with no in-app purchases.

### Do MarginNote 4 or 判別式電卓 have ads?

Neither MarginNote 4 nor 判別式電卓 shows ads.

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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.*