# RepeatDuck vs 时空回音

The clearest difference is in-app purchases: 时空回音 at none against RepeatDuck's 3. 时空回音 also leads on update cadence (weekly vs every 2 months). RepeatDuck's advantage is ads (none vs shown) and device support (3 vs 1). On price there is nothing between them.

Both are free to download. RepeatDuck sells 3 in-app purchases, starting at $1.99 per month. 时空回音 asks for nothing beyond the download.

RepeatDuck ships an update every 2 months, 时空回音 weekly. The most recent releases landed on October 30, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | RepeatDuck | 时空回音 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/repeatduck-chinese-master/id6740007643/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 147 MB | 23 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Chaojifeng (Xiamen) Network Technology Co., Ltd.](https://appshunter.io/developer/1779974143) | [NEOBARAN](https://appshunter.io/developer/1536103536) |

## What reviewers say

### RepeatDuck

[App page](https://appshunter.io/ios/app/repeatduck-chinese-master/id6740007643)

Master Chinese vocabulary with intelligent flashcards and spaced repetition. Features audio-based memorization, custom card creation, and detailed progress analytics. Learn efficiently with offline access and customizable reading modes.

**Highlights:** Audio-based memorization, Custom flashcard creation, Spaced repetition system, Progress tracking and analytics, Offline mode, Configurable learning languages

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro | $1.99 | per month |
| Yearly Pro | $9.99 | per year |
| Lifetime Pro | $19.99 | one-time |


### 时空回音

[App page](https://appshunter.io/ios/app/id6802930227)

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

**In-app purchases:** none


## Frequently asked questions

### Is RepeatDuck free?

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

### Is 时空回音 free?

时空回音 is free to download, with no in-app purchases.

### Do RepeatDuck or 时空回音 have ads?

时空回音 shows ads; RepeatDuck does not.

### Which is updated more often, RepeatDuck or 时空回音?

RepeatDuck ships an update every 2 months, and 时空回音 weekly. Most recently, RepeatDuck was updated on October 30, 2026 and 时空回音 on October 29, 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.*