# 投知卡 vs YNotes

The clearest difference is in-app purchases: 投知卡 at none against YNotes's 4. YNotes's advantage is update cadence (every 2 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. YNotes sells 4 in-app purchases, starting at $3.99 per month. 投知卡 asks for nothing beyond the download.

投知卡 ships an update every 3 weeks, YNotes every 2 days. Both last shipped on October 6, 2026.

## The numbers

| Metric | 投知卡 | YNotes |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 13 MB | 24 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yuanwang Luo](https://appshunter.io/developer/1868684859) | [佳辉 瞿](https://appshunter.io/developer/1886015317) |

## What reviewers say

### 投知卡

[App page](https://appshunter.io/ios/app/id6757800864)

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

**In-app purchases:** none


### YNotes

[App page](https://appshunter.io/ios/app/ynotes-ai-notes-pdf-study/id6760791622)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $3.99 | per month |
| Pro+ Monthly | $9.99 | per month |
| Pro Yearly | $29.99 | per year |
| Pro+ Yearly | $79.99 | per year |


## Frequently asked questions

### Is 投知卡 free?

投知卡 is free to download, with no in-app purchases.

### Is YNotes free?

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

### Do 投知卡 or YNotes have ads?

Neither 投知卡 nor YNotes shows ads.

### Which is updated more often, 投知卡 or YNotes?

投知卡 ships an update every 3 weeks, and YNotes every 2 days. Most recently, 投知卡 was updated on October 6, 2026 and YNotes on October 6, 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.*