# Mental Models vs Systems Thinking Daily

The clearest difference is price: Mental Models at Free against Systems Thinking Daily's $0.99. Systems Thinking Daily's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Mental Models is free to download; Systems Thinking Daily costs $0.99 up front. Mental Models sells 1 one-off in-app purchase. Systems Thinking Daily asks for nothing beyond the download.

## The numbers

| Metric | Mental Models | Systems Thinking Daily |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Size | 53 MB | 22 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Christos Tsavas](https://appshunter.io/developer/1887557969) | [JollofCreative LLC](https://appshunter.io/developer/1888948457) |

## What reviewers say

### 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 |


### Systems Thinking Daily

[App page](https://appshunter.io/ios/app/systems-thinking-daily/id6761329640)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mental Models free?

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

### Is Systems Thinking Daily free?

Systems Thinking Daily costs $0.99, with no in-app purchases.

### Do Mental Models or Systems Thinking Daily have ads?

Neither Mental Models nor Systems Thinking Daily 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.*