# Bubble Days vs Cairn

The clearest difference is in-app purchases: Bubble Days at none against Cairn's 3. Bubble Days also leads on ads (none vs shown) and update cadence (every 2 days vs every 5 days). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Cairn sells 3 in-app purchases, starting at $1.99 per month. Bubble Days asks for nothing beyond the download.

Bubble Days ships an update every 2 days, Cairn every 5 days. The most recent releases landed on October 7, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Bubble Days | Cairn |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 days** | Every 5 days |
| Size | 3 MB | 41 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [eunju kang](https://appshunter.io/developer/1883069776) | [Heajung Yoo](https://appshunter.io/developer/1895444232) |

## What reviewers say

### Bubble Days

[App page](https://appshunter.io/ios/app/bubble-days/id6761247874)

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

**In-app purchases:** none


### Cairn

[App page](https://appshunter.io/ios/app/cairn/id6767776784)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cairn Pro Monthly | $1.99 | per month |
| Cairn Pro yearly | $12.99 | per year |
| Cairn Pro - Ad-free forever | $0.99 | one-time |


## Frequently asked questions

### Is Bubble Days free?

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

### Is Cairn free?

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

### Do Bubble Days or Cairn have ads?

Cairn shows ads; Bubble Days does not.

### Which is updated more often, Bubble Days or Cairn?

Bubble Days ships an update every 2 days, and Cairn every 5 days. Most recently, Bubble Days was updated on October 7, 2026 and Cairn on October 12, 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.*