# 3n or Not vs 高校数学の解法

The clearest difference is in-app purchases: 3n or Not at none against 高校数学の解法's 2. 高校数学の解法's advantage is update cadence (every 4 days vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 高校数学の解法 sells 2 one-off in-app purchases. 3n or Not asks for nothing beyond the download.

3n or Not ships an update every 4 months, 高校数学の解法 every 4 days. The most recent releases landed on October 8, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | 3n or Not | 高校数学の解法 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/3n-or-not/id913003589/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 95.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Every 4 days** |
| Monetization | Ad-supported | — |
| Size | 13 MB | 152 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ninicode](https://appshunter.io/developer/647989501) | [Shogo Shibuya](https://appshunter.io/developer/1671795647) |

## What reviewers say

### 3n or Not

[App page](https://appshunter.io/ios/app/3n-or-not/id913003589)

Test your quick thinking with this educational game.  It challenges you to rapidly identify if a given number is divisible by three. Perfect for practicing mental math skills.

**Highlights:** Quick number discrimination, Multiple of 3 identification, Mental math practice, Educational game

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

**In-app purchases:** none


### 高校数学の解法

[App page](https://appshunter.io/ios/app/id6445906314)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告の非表示 | $2.99 | one-time |
| Premium（買い切り） | $14.99 | one-time |


## Frequently asked questions

### Is 3n or Not free?

3n or Not is free to download, with no in-app purchases.

### Is 高校数学の解法 free?

高校数学の解法 is free to download, with in-app purchases available.

### Do 3n or Not or 高校数学の解法 have ads?

Both 3n or Not and 高校数学の解法 show ads.

### Which is updated more often, 3n or Not or 高校数学の解法?

3n or Not ships an update every 4 months, and 高校数学の解法 every 4 days. Most recently, 3n or Not was updated on October 8, 2026 and 高校数学の解法 on October 10, 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.*