# CATU vs Spa Sky

The clearest difference is iOS requirement: Spa Sky at 12.4 against CATU's 14.4. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CATU ships an update every 11 days, Spa Sky weekly. The most recent releases landed on November 8, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | CATU | Spa Sky |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 days | **Weekly** |
| Size | 105 MB | 47 MB |
| Requires iOS | 14.4 | **12.4** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [ACTIVE LINK CO.,LTD](https://appshunter.io/developer/1773342803) | [1000M](https://appshunter.io/developer/1801021057) |

## What reviewers say

### CATU

[App page](https://appshunter.io/ios/app/catu/id6736875865)

**Features:** macOS Compatibility

**In-app purchases:** none


### Spa Sky

[App page](https://appshunter.io/ios/app/spa-sky/id6738811871)

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

**In-app purchases:** none


## Frequently asked questions

### Is CATU free?

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

### Is Spa Sky free?

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

### Do CATU or Spa Sky have ads?

Neither CATU nor Spa Sky shows ads.

### Which is updated more often, CATU or Spa Sky?

CATU ships an update every 11 days, and Spa Sky weekly. Most recently, CATU was updated on November 8, 2026 and Spa Sky on October 30, 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.*