# Fossil ID vs DuoNinja

The clearest difference is iOS requirement: DuoNinja at 15.0 against Fossil ID's 26.2. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Fossil ID sells 1 in-app purchase, starting at $1.99 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.

## The numbers

| Metric | Fossil ID | DuoNinja |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/duoninja/id6785968577/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Every 3 days |
| Monetization | — | Freemium |
| Size | 3 MB | 13 MB |
| Requires iOS | 26.2 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [剑炜 陈](https://appshunter.io/developer/1868267178) | [Mink OÜ](https://appshunter.io/developer/1689550774) |

## What reviewers say

### Fossil ID

[App page](https://appshunter.io/ios/app/fossil-id/id6759972364)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Pro | $1.99 | per month |


### 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 Fossil ID free?

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

### Is DuoNinja free?

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

### Do Fossil ID or DuoNinja have ads?

Neither Fossil ID nor DuoNinja shows ads.

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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.*