# 记乎 vs 氢刻

The clearest difference is rating: 氢刻 at 5.0 against 记乎's 4.2. 记乎's advantage is update cadence (every 2 days vs every 3 weeks) and ratings volume (35 vs 5). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. 记乎 sells 16 one-off in-app purchases and 氢刻 sells 8 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

氢刻 holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: 记乎 has 35 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 82% of 记乎's written reviews are positive against 83% of 氢刻's.

记乎 ships an update every 2 days, 氢刻 every 3 weeks. Both last shipped on October 30, 2026.

## The numbers

| Metric | 记乎 | 氢刻 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (35 ratings)](https://appshunter.io/ios/app/id1460634473/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ai/id1585104628/reviews)** |
| Number of ratings | **35** | 5 |
| Positive reviews | 82.1% of reviews | **83.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 weeks |
| Monetization | Freemium | Free with in-app purchases |
| Size | 90 MB | 22 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [四川金字塔教育咨询有限公司](https://appshunter.io/developer/1194953013) | [QingKe Tech Co., Ltd.](https://appshunter.io/developer/1584950202) |

## What reviewers say

### 记乎

[App page](https://appshunter.io/ios/app/id1460634473)

This app utilizes the Ebbinghaus forgetting curve to intelligently schedule review sessions for your study materials. It offers a vast library of pre-made flashcard sets and allows for custom card creation, supporting various question types and multimedia. Collaborate with classmates or share your own decks.

**Highlights:** Intelligent review scheduling, Vast library of study card packs, Customizable flashcard creation, Practice quizzes and tests, Collaborative learning features, Cross-device cloud synchronization

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

**In-app purchases (16)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 6个记乎币 | $0.99 | one-time |
| 1记乎币 | $0.99 | one-time |
| 10记乎币 | $0.99 | one-time |
| 云空间扩容包10G | $1.99 | one-time |
| 18记乎币 | $2.99 | one-time |
| 记乎月度会员 | $2.99 | one-time |
| 20记乎币 | $2.99 | one-time |
| 记乎季度会员 | $3.99 | one-time |
| 28记乎币 | $3.99 | one-time |
| 季度会员 | $4.99 | one-time |
| 40记乎币 | $5.99 | one-time |
| 云空间扩容包50G | $7.99 | one-time |
| 记乎年度会员 | $9.99 | one-time |
| 年度会员 | $9.99 | one-time |
| 88记乎币 | $12.99 | one-time |
| 188记乎币 | $29.99 | one-time |


### 氢刻

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

This tool helps you capture, organize, and recall information using a structured card system. It leverages AI to extract key points and generate study aids like flashcards and quizzes. Share and learn from community-created card sets for efficient knowledge acquisition.

**Highlights:** AI-powered note extraction, Flashcard creation and review, Scientific learning and recall methods, Structured card-based knowledge base, Content sharing community, Import from WeChat Read and Anki

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP of one month | $1.99 | one-time |
| 氢刻专业版-1个月 | $2.99 | one-time |
| VIP of one year | $12.99 | one-time |
| 氢刻专业版-1年 | $19.99 | one-time |
| VIP of three years | $29.99 | one-time |
| 氢刻专业版-3年 | $39.99 | one-time |
| Premium Lifetime | $69.99 | one-time |
| Pro Lifetime | $89.99 | one-time |


## Frequently asked questions

### Is 记乎 free?

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

### Is 氢刻 free?

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

### Which has better reviews, 记乎 or 氢刻?

氢刻 is rated higher. 记乎 averages 4.2 out of 5 from 35 ratings, while 氢刻 averages 5.0 from 5 ratings.

### Do 记乎 or 氢刻 have ads?

Neither 记乎 nor 氢刻 shows ads.

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

记乎 ships an update every 2 days, and 氢刻 every 3 weeks. Most recently, 记乎 was updated on October 30, 2026 and 氢刻 on October 30, 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.*