# Grow Fluency vs DuoNinja

The clearest difference is rating: DuoNinja at 5.0 against Grow Fluency's 3.5. On price, review sentiment, ratings volume and update cadence there is nothing between them.

Both are free to download. Grow Fluency sells 2 in-app purchases, starting at $4.99 per month and DuoNinja sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

DuoNinja holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 4 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Grow Fluency ships an update every 4 days, DuoNinja every 3 days. Both last shipped on October 7, 2026.

## The numbers

| Metric | Grow Fluency | DuoNinja |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (4 ratings)](https://appshunter.io/ios/app/grow-fluency-learn-languages/id6766739898/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/duoninja/id6785968577/reviews)** |
| Number of ratings | **4** | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 3 days** |
| Monetization | Freemium | Freemium |
| Size | 70 MB | 13 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Josiah Reed](https://appshunter.io/developer/1896320359) | [Mink OÜ](https://appshunter.io/developer/1689550774) |

## What reviewers say

### Grow Fluency

[App page](https://appshunter.io/ios/app/grow-fluency-learn-languages/id6766739898)

Learn languages by reading engaging stories. Tap any word for instant translation and save it for spaced repetition review. An AI tutor and Anki import support your learning journey.

**Highlights:** Learn through stories, Tap-to-translate, Spaced repetition review, AI language tutor, Import vocabulary (Anki), Progress tracking

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gibberfish Pro | $4.99 | per month |
| Gibberfish Pro | $39.99 | per year |


### DuoNinja

[App page](https://appshunter.io/ios/app/duoninja/id6785968577)

Master new languages through comprehensible input and build vocabulary with interactive lessons. Enhance reading and listening fluency with authentic content like news and books. Utilize AI-powered tools and dictionaries to quickly look up words and fill knowledge gaps.

**Highlights:** Comprehensible input for language mastery, Vocabulary building lessons, Reading and listening fluency practice, News, texts, and book content, Flashcards for knowledge gaps, AI-powered word lookup, Dictionary integration

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $7.99 | per month |
| Premium Yearly | $47.90 | per year |


## Frequently asked questions

### Is Grow Fluency free?

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

### Is DuoNinja free?

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

### Which has better reviews, Grow Fluency or DuoNinja?

DuoNinja is rated higher. Grow Fluency averages 3.5 out of 5 from 4 ratings, while DuoNinja averages 5.0 from 2 ratings.

### Do Grow Fluency or DuoNinja have ads?

Neither Grow Fluency nor DuoNinja shows ads.

### Which is updated more often, Grow Fluency or DuoNinja?

Grow Fluency ships an update every 4 days, and DuoNinja every 3 days. Most recently, Grow Fluency was updated on October 7, 2026 and DuoNinja on October 7, 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.*