# Plain850：核心英文 850詞 vs 日本語の鬼

The clearest difference is in-app purchases: Plain850：核心英文 850詞 at none against 日本語の鬼's 2. Plain850：核心英文 850詞 also leads on ads (none vs shown) and iOS requirement (13.0 vs 17.0). On price, update cadence and device support there is nothing between them.

Both are free to download. 日本語の鬼 sells 2 in-app purchases, starting at $4.99 per month. Plain850：核心英文 850詞 asks for nothing beyond the download.

Plain850：核心英文 850詞 ships an update every 2 weeks, 日本語の鬼 weekly. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Plain850：核心英文 850詞 | 日本語の鬼 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Weekly** |
| Size | 43 MB | 239 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lok Wai](https://appshunter.io/developer/1895320924) | [KAIEN CHUNG](https://appshunter.io/developer/1892933387) |

## What reviewers say

### Plain850：核心英文 850詞

[App page](https://appshunter.io/ios/app/plain850-850/id6776902920)

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

**In-app purchases:** none


### 日本語の鬼

[App page](https://appshunter.io/ios/app/id6786530422)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Oni Pro (Monthly) | $4.99 | per month |
| Oni Pro (Yearly) | $49.99 | per year |


## Frequently asked questions

### Is Plain850：核心英文 850詞 free?

Plain850：核心英文 850詞 is free to download, with no in-app purchases.

### Is 日本語の鬼 free?

日本語の鬼 is free to download, with in-app purchases available.

### Do Plain850：核心英文 850詞 or 日本語の鬼 have ads?

日本語の鬼 shows ads; Plain850：核心英文 850詞 does not.

### Which is updated more often, Plain850：核心英文 850詞 or 日本語の鬼?

Plain850：核心英文 850詞 ships an update every 2 weeks, and 日本語の鬼 weekly. Most recently, Plain850：核心英文 850詞 was updated on October 31, 2026 and 日本語の鬼 on November 5, 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.*