# AI CogniSphere vs マスタン英単語

AI CogniSphere and マスタン英単語 are too close to call on the numbers: across 3 compared parameters — price, in-app purchases and iOS requirement among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. AI CogniSphere sells 1 in-app purchase, starting at $3.99 per month and マスタン英単語 sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | AI CogniSphere | マスタン英単語 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/toeic/id6760566858/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Update frequency | — | Every 2 weeks |
| Size | 11 MB | 35 MB |
| Requires iOS | 18.6 | **17.0** |
| Age rating | 4+ | 4+ |
| Developer | [YiAn Hsueh](https://appshunter.io/developer/1825079989) | [Norihiro Sakamoto](https://appshunter.io/developer/1885026853) |

## What reviewers say

### AI CogniSphere

[App page](https://appshunter.io/ios/app/ai-cognisphere/id6760450042)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CogniSphere Pro Monthly | $3.99 | per month |


### マスタン英単語

[App page](https://appshunter.io/ios/app/toeic/id6760566858)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro １ヶ月プラン | $4.99 | per month |
| Pro 年間プラン | $34.99 | per year |


## Frequently asked questions

### Is AI CogniSphere free?

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

### Is マスタン英単語 free?

マスタン英単語 is free to download, with in-app purchases available.

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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.*