# Phobias Guide.. vs Cairn Koans

The clearest difference is ads: Cairn Koans at none against Phobias Guide..'s shown. Phobias Guide..'s advantage is update cadence (every 2 weeks vs every 2 months) and iOS requirement (13.0 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Phobias Guide.. sells 2 in-app purchases, starting at $1.99 per month and Cairn Koans sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Phobias Guide.. ships an update every 2 weeks, Cairn Koans every 2 months. The most recent releases landed on October 18, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Phobias Guide.. | Cairn Koans |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Size | 156 MB | 40 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Olga Ivanova](https://appshunter.io/developer/1733570435) | [Drew Douglass](https://appshunter.io/developer/1887999660) |

## What reviewers say

### Phobias Guide..

[App page](https://appshunter.io/ios/app/phobias-guide/id6742685294)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| phobias_by_oliva_subscription | $1.99 | per month |
| phobias_by_oliva_donation | $1.99 | one-time |


### 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 |


## Frequently asked questions

### Is Phobias Guide.. free?

Phobias Guide.. is free to download, with in-app purchases available.

### Is Cairn Koans free?

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

### Do Phobias Guide.. or Cairn Koans have ads?

Phobias Guide.. shows ads; Cairn Koans does not.

### Which is updated more often, Phobias Guide.. or Cairn Koans?

Phobias Guide.. ships an update every 2 weeks, and Cairn Koans every 2 months. Most recently, Phobias Guide.. was updated on October 18, 2026 and Cairn Koans on October 14, 2026.

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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.*