# Nature Guide vs Cairn Koans

The clearest difference is ads: Cairn Koans at none against Nature Guide's shown. Nature Guide's advantage is update cadence (weekly vs every 2 months) and iOS requirement (15.0 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Nature Guide sells 1 in-app purchase, 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.

Nature Guide ships an update weekly, Cairn Koans every 2 months. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Nature Guide | Cairn Koans |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nature-guide-id-and-explore/id6742056909/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 86 MB | 40 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Relax Software, LLC](https://appshunter.io/developer/1692483871) | [Drew Douglass](https://appshunter.io/developer/1887999660) |

## What reviewers say

### Nature Guide

[App page](https://appshunter.io/ios/app/nature-guide-id-and-explore/id6742056909)

Instantly identify plants, animals, and insects with AI by snapping a photo. Diagnose plant diseases and get care tips. Explore nearby nature spots and learn fascinating facts daily.

**Highlights:** AI-powered identification, Plant disease diagnosis, Nearby nature exploration, AI nature expert chat, Daily nature facts, Multi-photo identification

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $1.99 | per month |


### 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 Nature Guide free?

Nature 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 Nature Guide or Cairn Koans have ads?

Nature Guide shows ads; Cairn Koans does not.

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

Nature Guide ships an update weekly, and Cairn Koans every 2 months. Most recently, Nature Guide was updated on October 30, 2026 and Cairn Koans on October 25, 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.*