# Cairn vs Arrowmi

The clearest difference is in-app purchases: Arrowmi at none against Cairn's 1. Cairn's advantage is update cadence (every 11 days vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Cairn sells 1 one-off in-app purchase. Arrowmi asks for nothing beyond the download.

Cairn ships an update every 11 days, Arrowmi every 3 months. The most recent releases landed on November 5, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Cairn | Arrowmi |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 3 months |
| Size | 8 MB | 43 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Branko Borota](https://appshunter.io/developer/1228658475) | [Mustafa Kilic](https://appshunter.io/developer/1628559720) |

## What reviewers say

### Cairn

[App page](https://appshunter.io/ios/app/cairn-stone-stack/id6782169883)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee | $1.99 | one-time |


### Arrowmi

[App page](https://appshunter.io/ios/app/arrowmi/id6782682605)

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

**In-app purchases:** none


## Frequently asked questions

### Is Cairn free?

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

### Is Arrowmi free?

Arrowmi is free to download, with no in-app purchases.

### Do Cairn or Arrowmi have ads?

Neither Cairn nor Arrowmi shows ads.

### Which is updated more often, Cairn or Arrowmi?

Cairn ships an update every 11 days, and Arrowmi every 3 months. Most recently, Cairn was updated on November 5, 2026 and Arrowmi on November 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*