# Cairn Koans vs The Unseen Mind

The clearest difference is iOS requirement: The Unseen Mind at 15.0 against Cairn Koans's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Cairn Koans sells 4 one-off in-app purchases and The Unseen Mind sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Cairn Koans | The Unseen Mind |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Size | 40 MB | 75 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Drew Douglass](https://appshunter.io/developer/1887999660) | [Sepehr Taghavi](https://appshunter.io/developer/1876939414) |

## What reviewers say

### Cairn Koans

[App page](https://appshunter.io/ios/app/cairn-koans/id6762514658)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| A Pebble | $1.99 | one-time |
| A Stone | $4.99 | one-time |
| A Standing Stone | $9.99 | one-time |
| A Cornerstone | $19.99 | one-time |


### The Unseen Mind

[App page](https://appshunter.io/ios/app/the-unseen-mind/id6773108517)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $9.99 | per month |
| Yearly Premium | $89.99 | per year |


## Frequently asked questions

### Is Cairn Koans free?

Cairn Koans is free to download, with in-app purchases available.

### Is The Unseen Mind free?

The Unseen Mind is free to download, with in-app purchases available.

### Do Cairn Koans or The Unseen Mind have ads?

Neither Cairn Koans nor The Unseen Mind 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.*