# Cairn vs Fastly Fasting Tracker

The clearest difference is in-app purchases: Fastly Fasting Tracker at none against Cairn's 2. Cairn's advantage is iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Cairn sells 2 in-app purchases, starting at $4.99 per month. Fastly Fasting Tracker asks for nothing beyond the download.

## The numbers

| Metric | Cairn | Fastly Fasting Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | — | Every 3 months |
| Size | 44 MB | 46 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Huy Nguyen](https://appshunter.io/developer/1896764157) | [Gunawan Santoso](https://appshunter.io/developer/1843786072) |

## What reviewers say

### Cairn

[App page](https://appshunter.io/ios/app/cairn-sober-streak-tracker/id6781625086)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cairn Reflection Monthly | $4.99 | per month |
| Cairn Reflection Annually | $39.99 | per year |


### Fastly Fasting Tracker

[App page](https://appshunter.io/ios/app/fastly-fasting-tracker/id6787811600)

**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 Fastly Fasting Tracker free?

Fastly Fasting Tracker is free to download, with no in-app purchases.

### Do Cairn or Fastly Fasting Tracker have ads?

Neither Cairn nor Fastly Fasting Tracker 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.*