# Binary Challenge vs Mental Models

The clearest difference is in-app purchases: Binary Challenge at none against Mental Models's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Mental Models sells 1 one-off in-app purchase. Binary Challenge asks for nothing beyond the download.

## The numbers

| Metric | Binary Challenge | Mental Models |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 61 months | — |
| Size | 3 MB | 53 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ola Kaare Risa](https://appshunter.io/developer/1562401648) | [Christos Tsavas](https://appshunter.io/developer/1887557969) |

## What reviewers say

### Binary Challenge

[App page](https://appshunter.io/ios/app/binary-challenge/id1564728589)

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

**In-app purchases:** none


### Mental Models

[App page](https://appshunter.io/ios/app/mental-models-mind-models/id6761058477)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $6.99 | one-time |


## Frequently asked questions

### Is Binary Challenge free?

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

### Is Mental Models free?

Mental Models is free to download, with in-app purchases available.

### Do Binary Challenge or Mental Models have ads?

Neither Binary Challenge nor Mental Models 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.*