# Trigger vs Cairn

The clearest difference is in-app purchases: Cairn at none against Trigger's 2. Trigger's advantage is update cadence (weekly vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Trigger sells 2 in-app purchases, starting at $6.99 per month. Cairn asks for nothing beyond the download.

Trigger ships an update weekly, Cairn every 3 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Trigger | Cairn |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/trigger-skin-tracker/id6787020115/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 months |
| Size | 49 MB | 38 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Surya Palsam](https://appshunter.io/developer/6787020117) | [LUKAS ANDREAS NILSEN](https://appshunter.io/developer/1866243718) |

## What reviewers say

### Trigger

[App page](https://appshunter.io/ios/app/trigger-skin-tracker/id6787020115)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Trigger Pro Monthly | $6.99 | per month |
| Trigger Pro Annual | $49.99 | per year |


### Cairn

[App page](https://appshunter.io/ios/app/cairn-gentle-habit-tracker/id6789920818)

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

**In-app purchases:** none


## Frequently asked questions

### Is Trigger free?

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

### Is Cairn free?

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

### Do Trigger or Cairn have ads?

Neither Trigger nor Cairn shows ads.

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

Trigger ships an update weekly, and Cairn every 3 months. Most recently, Trigger was updated on October 24, 2026 and Cairn on October 24, 2026.

---

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