# Mosaic Days vs YiKey

The clearest difference is in-app purchases: YiKey at none against Mosaic Days's 4. YiKey also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Mosaic Days sells 4 in-app purchases, starting at $49.99 per year. YiKey asks for nothing beyond the download.

Mosaic Days ships an update every 2 days, YiKey every 3 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Mosaic Days | YiKey |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 3 days |
| Size | 666 MB | 50 MB |
| Requires iOS | 17.4 | **17.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Lai Guanwei](https://appshunter.io/developer/1820744159) | [Chiunluen Meng cao](https://appshunter.io/developer/6773870405) |

## What reviewers say

### Mosaic Days

[App page](https://appshunter.io/ios/app/mosaic-days/id6760643904)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Beauty Pro – 5 Staff Plan | $49.99 | per year |
| pro subscription | $59.99 | per year |
| Beauty Pro – 10 Staff Plan | $99.99 | per year |
| Permanently unlocked | $49.99 | one-time |


### YiKey

[App page](https://appshunter.io/ios/app/yikey/id6782687624)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mosaic Days free?

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

### Is YiKey free?

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

### Do Mosaic Days or YiKey have ads?

Mosaic Days shows ads; YiKey does not.

### Which is updated more often, Mosaic Days or YiKey?

Mosaic Days ships an update every 2 days, and YiKey every 3 days. Most recently, Mosaic Days was updated on October 31, 2026 and YiKey on October 31, 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.*