# Missing Numbers Minds vs Inverse Proportion

The clearest difference is in-app purchases: Inverse Proportion at none against Missing Numbers Minds's 2. Inverse Proportion also leads on iOS requirement (12.0 vs 26.1). On price, ads and device support there is nothing between them.

Both are free to download. Missing Numbers Minds sells 2 one-off in-app purchases. Inverse Proportion asks for nothing beyond the download.

## The numbers

| Metric | Missing Numbers Minds | Inverse Proportion |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | — |
| Size | 4 MB | 32 MB |
| Requires iOS | 26.1 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Juan Fullana](https://appshunter.io/developer/692107580) | [Science Education Institute](https://appshunter.io/developer/1439710468) |

## What reviewers say

### Missing Numbers Minds

[App page](https://appshunter.io/ios/app/missing-numbers-minds/id980949764)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Donation for maintenance. | $0.99 | one-time |
| Extra for develop and maintenance | $0.99 | one-time |


### Inverse Proportion

[App page](https://appshunter.io/ios/app/inverse-proportion/id6736589300)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Missing Numbers Minds free?

Missing Numbers Minds is free to download, with in-app purchases available.

### Is Inverse Proportion free?

Inverse Proportion is free to download, with no in-app purchases.

### Do Missing Numbers Minds or Inverse Proportion have ads?

Neither Missing Numbers Minds nor Inverse Proportion shows ads.

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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.*