# 知止 vs 好记AI

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

Both are free to download. 好记AI sells 2 in-app purchases, starting at $0.99 per month. 知止 asks for nothing beyond the download.

知止 ships an update monthly, 好记AI every 4 days. The most recent releases landed on October 31, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 知止 | 好记AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Size | 14 MB | 12 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [玉庭 何](https://appshunter.io/developer/1867438392) | [文幸 韦](https://appshunter.io/developer/6796785287) |

## What reviewers say

### 知止

[App page](https://appshunter.io/ios/app/id6758208809)

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

**In-app purchases:** none


### 好记AI

[App page](https://appshunter.io/ios/app/ai-siri-plus/id6799427316)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Membership (Monthly) | $0.99 | per month |
| Pro Member (Yearly) | $12.99 | per year |


## Frequently asked questions

### Is 知止 free?

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

### Is 好记AI free?

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

### Do 知止 or 好记AI have ads?

Neither 知止 nor 好记AI shows ads.

### Which is updated more often, 知止 or 好记AI?

知止 ships an update monthly, and 好记AI every 4 days. Most recently, 知止 was updated on October 31, 2026 and 好记AI on October 25, 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.*