# 氢刻 vs 小灵鸭

The clearest difference is review sentiment: 氢刻 at 83% against 小灵鸭's 75%. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. 氢刻 sells 8 one-off in-app purchases and 小灵鸭 sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | 氢刻 | 小灵鸭 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ai/id1585104628/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | **83.3% of reviews** | 75.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | — |
| Size | 20 MB | 32 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [QingKe Tech Co., Ltd.](https://appshunter.io/developer/1584950202) | [Shanghai Shuyi Education Technology Co., Ltd.](https://appshunter.io/developer/1563391532) |

## What reviewers say

### 氢刻

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

This app helps you capture, organize, and recall information through a structured card system. It utilizes AI to extract key points and generate study materials like flashcards and quizzes. Share and access learning resources within a community to enhance your knowledge retention and thinking.

**Highlights:** Card-based note-taking, AI-powered key point extraction, Intelligent review and recall (Anki-style), Flashcard and quiz generation, Community sharing of card sets, Import notes from WeChat Read, Scientific statistics and progress tracking

**Features:** macOS Compatibility, Vision Pro support, iPhone Duo 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 |


### 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 |


## Frequently asked questions

### Is 氢刻 free?

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

### Is 小灵鸭 free?

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

### Do 氢刻 or 小灵鸭 have ads?

Neither 氢刻 nor 小灵鸭 shows ads.

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

氢刻 ships an update every 3 weeks, and 小灵鸭 every 3 weeks. Most recently, 氢刻 was updated on November 7, 2026 and 小灵鸭 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.*