# 小灵鸭 vs KeyMemo

The clearest difference is update cadence: KeyMemo at daily against 小灵鸭's every 3 weeks. 小灵鸭's advantage is iOS requirement (15.0 vs 17). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 小灵鸭 sells 3 one-off in-app purchases and KeyMemo sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

小灵鸭 ships an update every 3 weeks, KeyMemo daily. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 小灵鸭 | KeyMemo |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Daily** |
| Size | 32 MB | 12 MB |
| Requires iOS | **15.0** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shanghai Shuyi Education Technology Co., Ltd.](https://appshunter.io/developer/1563391532) | [超 刘](https://appshunter.io/developer/1812913202) |

## What reviewers say

### 小灵鸭

[App page](https://appshunter.io/ios/app/id6736635589)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 畅学月卡 | $0.99 | one-time |
| 畅学年卡 | $8.99 | one-time |
| 永恒钻石卡 | $9.99 | one-time |


### KeyMemo

[App page](https://appshunter.io/ios/app/keymemo/id6768071867)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| KeyMemo Premium | $2.99 | one-time |


## Frequently asked questions

### Is 小灵鸭 free?

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

### Is KeyMemo free?

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

### Do 小灵鸭 or KeyMemo have ads?

Neither 小灵鸭 nor KeyMemo shows ads.

### Which is updated more often, 小灵鸭 or KeyMemo?

小灵鸭 ships an update every 3 weeks, and KeyMemo daily. Most recently, 小灵鸭 was updated on October 7, 2026 and KeyMemo on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*