# 氢刻 vs KeyMemo

The clearest difference is update cadence: KeyMemo at daily against 氢刻's every 3 weeks. 氢刻's advantage is iOS requirement (13.4 vs 17). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 氢刻 sells 6 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.

氢刻 ships an update every 3 weeks, KeyMemo daily. The most recent releases landed on October 8, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | 氢刻 | KeyMemo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ai/id1585104628/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 22 MB | 12 MB |
| Requires iOS | **13.4** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [QingKe Tech Co., Ltd.](https://appshunter.io/developer/1584950202) | [超 刘](https://appshunter.io/developer/1812913202) |

## What reviewers say

### 氢刻

[App page](https://appshunter.io/ios/app/ai/id1585104628)

This tool helps you capture, organize, and recall information through a structured card system. It uses AI and spaced repetition techniques to enhance memory and learning. Share and import notes to build a personalized knowledge base.

**Highlights:** AI-powered note-taking, Spaced repetition learning, Card-based knowledge base, Content sharing community, Import notes from WeChat Read, Anki-style flashcards

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP of one month | $0.99 | one-time |
| 氢刻专业版-1个月 | $1.99 | one-time |
| VIP of one year | $9.99 | one-time |
| 氢刻专业版-1年 | $14.99 | one-time |
| VIP of three years | $24.99 | one-time |
| 氢刻专业版-3年 | $29.99 | 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 氢刻 free?

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

### Is KeyMemo free?

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

### Do 氢刻 or KeyMemo have ads?

Neither 氢刻 nor KeyMemo shows ads.

### Which is updated more often, 氢刻 or KeyMemo?

氢刻 ships an update every 3 weeks, and KeyMemo daily. Most recently, 氢刻 was updated on October 8, 2026 and KeyMemo on October 12, 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.*