# π Challenge vs 中学生の英単語帳800

The clearest difference is in-app purchases: π Challenge at none against 中学生の英単語帳800's 1. π Challenge also leads on ads (none vs shown) and iOS requirement (13.0 vs 26.0). 中学生の英単語帳800's advantage is update cadence (weekly vs every 9 months). On price and device support there is nothing between them.

Both are free to download. 中学生の英単語帳800 sells 1 in-app purchase, starting at $2.99 per month. π Challenge asks for nothing beyond the download.

π Challenge ships an update every 9 months, 中学生の英単語帳800 weekly. The most recent releases landed on October 10, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | π Challenge | 中学生の英単語帳800 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Weekly** |
| Size | 29 MB | 8 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Warashibe Tech LLC](https://appshunter.io/developer/1567747524) | [ASAHI TAKATSUKA](https://appshunter.io/developer/1811960139) |

## What reviewers say

### π Challenge

[App page](https://appshunter.io/ios/app/challenge/id6743357759)

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

**In-app purchases:** none


### 中学生の英単語帳800

[App page](https://appshunter.io/ios/app/800/id6755569208)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Proプラン | $2.99 | per month |


## Frequently asked questions

### Is π Challenge free?

π Challenge is free to download, with no in-app purchases.

### Is 中学生の英単語帳800 free?

中学生の英単語帳800 is free to download, with in-app purchases available.

### Do π Challenge or 中学生の英単語帳800 have ads?

中学生の英単語帳800 shows ads; π Challenge does not.

### Which is updated more often, π Challenge or 中学生の英単語帳800?

π Challenge ships an update every 9 months, and 中学生の英単語帳800 weekly. Most recently, π Challenge was updated on October 10, 2026 and 中学生の英単語帳800 on October 24, 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.*