# Nelson vs Mental Models

The clearest difference is in-app purchases: Nelson 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. Nelson asks for nothing beyond the download.

## The numbers

| Metric | Nelson | Mental Models |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | — |
| Size | 75 MB | 53 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Aditha Jayasuriya](https://appshunter.io/developer/1820922703) | [Christos Tsavas](https://appshunter.io/developer/1887557969) |

## What reviewers say

### Nelson

[App page](https://appshunter.io/ios/app/nelson-smarter-every-day/id6747343441)

**Features:** 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 Nelson free?

Nelson 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 Nelson or Mental Models have ads?

Neither Nelson 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.*