# GSL Builder Multilingual vs RepeatDuck

The clearest difference is in-app purchases: GSL Builder Multilingual at none against RepeatDuck's 3. GSL Builder Multilingual also leads on iOS requirement (13.0 vs 15.0). RepeatDuck's advantage is update cadence (every 2 months vs every 108 months). On price, ads and device support there is nothing between them.

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

GSL Builder Multilingual ships an update every 108 months, RepeatDuck every 2 months. The most recent releases landed on October 6, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | GSL Builder Multilingual | RepeatDuck |
| --- | --- | --- |
| 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 | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 108 months | **Every 2 months** |
| Monetization | — | Free with in-app purchases |
| Size | 179 MB | 147 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [EFL Technologies](https://appshunter.io/developer/942981362) | [Chaojifeng (Xiamen) Network Technology Co., Ltd.](https://appshunter.io/developer/1779974143) |

## What reviewers say

### GSL Builder Multilingual

[App page](https://appshunter.io/ios/app/gsl-builder-multilingual/id1097695397)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is GSL Builder Multilingual free?

GSL Builder Multilingual is free to download, with no in-app purchases.

### Is RepeatDuck free?

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

### Do GSL Builder Multilingual or RepeatDuck have ads?

Neither GSL Builder Multilingual nor RepeatDuck shows ads.

### Which is updated more often, GSL Builder Multilingual or RepeatDuck?

GSL Builder Multilingual ships an update every 108 months, and RepeatDuck every 2 months. Most recently, GSL Builder Multilingual was updated on October 6, 2026 and RepeatDuck on October 4, 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.*