# π ~PI~ vs KANJI the difference

The clearest difference is ads: π ~PI~ at none against KANJI the difference's shown. π ~PI~ also leads on monetization model (free vs ad-supported) and iOS requirement (8.0 vs 18.0). KANJI the difference's advantage is update cadence (every 3 months vs every 6 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

π ~PI~ ships an update every 6 months, KANJI the difference every 3 months. The most recent releases landed on September 27, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | π ~PI~ | KANJI the difference |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/kanji-the-difference/id1521522649/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 3 months** |
| Monetization | **Free** | Ad-supported |
| Size | 23 MB | 15 MB |
| Requires iOS | **8.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yuki Takeda](https://appshunter.io/developer/1021096508) | [Shuya Komiya](https://appshunter.io/developer/1504097686) |

## What reviewers say

### π ~PI~

[App page](https://appshunter.io/ios/app/pi/id1077740864)

Learn the digits of pi with engaging practice and challenge modes. Test your memory and see how many digits you can recall. Perfect for math enthusiasts and those looking to improve their memorization skills.

**Highlights:** Learn pi digits, Practice mode, Challenge mode, Memorize long sequences

**Features:** Vision Pro support

**In-app purchases:** none


### KANJI the difference

[App page](https://appshunter.io/ios/app/kanji-the-difference/id1521522649)

Test your kanji recognition skills by finding the single different character among similar ones within a 30-second time limit. Earn bonus points for consecutive correct answers and track your progress with detailed play statistics. Enjoy a collection of over 300 questions, from common to obscure kanji, accompanied by calming background music.

**Highlights:** Find different kanji, 30-second time limit, Consecutive answer bonus, Over 300 questions, Score sharing, Play status tracking, Calming background music

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is π ~PI~ free?

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

### Is KANJI the difference free?

KANJI the difference is free to download, with no in-app purchases.

### Do π ~PI~ or KANJI the difference have ads?

KANJI the difference shows ads; π ~PI~ does not.

### Which is updated more often, π ~PI~ or KANJI the difference?

π ~PI~ ships an update every 6 months, and KANJI the difference every 3 months. Most recently, π ~PI~ was updated on September 27, 2026 and KANJI the difference on September 30, 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.*