# How Math Works vs 感染対策Navi/手順を場面から引く

The clearest difference is update cadence: How Math Works at every 6 days against 感染対策Navi/手順を場面から引く's every 5 weeks. How Math Works also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. How Math Works sells 1 in-app purchase, starting at $3.99 per month and 感染対策Navi/手順を場面から引く sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

How Math Works ships an update every 6 days, 感染対策Navi/手順を場面から引く every 5 weeks. The most recent releases landed on October 9, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | How Math Works | 感染対策Navi/手順を場面から引く |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 5 weeks |
| Size | 29 MB | 19 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Tsuyoshi Chujo](https://appshunter.io/developer/1481316741) | [Takahiro Ito](https://appshunter.io/developer/6787806782) |

## What reviewers say

### How Math Works

[App page](https://appshunter.io/ios/app/how-math-works/id6787864882)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan (Monthly) | $3.99 | per month |


### 感染対策Navi/手順を場面から引く

[App page](https://appshunter.io/ios/app/navi/id6802324628)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| フル解放（全36トピック） | $3.99 | one-time |


## Frequently asked questions

### Is How Math Works free?

How Math Works is free to download, with in-app purchases available.

### Is 感染対策Navi/手順を場面から引く free?

感染対策Navi/手順を場面から引く is free to download, with in-app purchases available.

### Do How Math Works or 感染対策Navi/手順を場面から引く have ads?

Neither How Math Works nor 感染対策Navi/手順を場面から引く shows ads.

### Which is updated more often, How Math Works or 感染対策Navi/手順を場面から引く?

How Math Works ships an update every 6 days, and 感染対策Navi/手順を場面から引く every 5 weeks. Most recently, How Math Works was updated on October 9, 2026 and 感染対策Navi/手順を場面から引く on October 19, 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.*