# 수면지킴이(Sleep Keeper) vs MOJO KING

The clearest difference is in-app purchases: 수면지킴이(Sleep Keeper) at none against MOJO KING's 5. 수면지킴이(Sleep Keeper) also leads on iOS requirement (11.0 vs 15.0). MOJO KING's advantage is device support (4 vs 2). On price, update cadence and ads there is nothing between them.

Both are free to download. MOJO KING sells 5 in-app purchases, starting at $4.99 per month. 수면지킴이(Sleep Keeper) asks for nothing beyond the download.

수면지킴이(Sleep Keeper) ships an update fortnightly, MOJO KING every 8 days. The most recent releases landed on November 7, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | 수면지킴이(Sleep Keeper) | MOJO KING |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 8 days** |
| Size | 142 MB | 86 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [Swing2App Co. Ltd.](https://appshunter.io/developer/573223450) | [6Letters](https://appshunter.io/developer/1832272890) |

## What reviewers say

### 수면지킴이(Sleep Keeper)

[App page](https://appshunter.io/ios/app/sleep-keeper/id6448084250)

**Features:** macOS Compatibility

**In-app purchases:** none


### MOJO KING

[App page](https://appshunter.io/ios/app/mojo-king/id6756033058)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MOJO KING Pro (Monthly) | $4.99 | per month |
| MOJO KING Premium (Monthly) | $9.99 | per month |
| MOJO KING Pro (Yearly) | $39.99 | per year |
| MOJO KING Premium (Monthly) | $69.99 | per year |
| MOJO KING Premium (Lifetime) | $149.00 | one-time |


## Frequently asked questions

### Is 수면지킴이(Sleep Keeper) free?

수면지킴이(Sleep Keeper) is free to download, with no in-app purchases.

### Is MOJO KING free?

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

### Do 수면지킴이(Sleep Keeper) or MOJO KING have ads?

Neither 수면지킴이(Sleep Keeper) nor MOJO KING shows ads.

### Which is updated more often, 수면지킴이(Sleep Keeper) or MOJO KING?

수면지킴이(Sleep Keeper) ships an update fortnightly, and MOJO KING every 8 days. Most recently, 수면지킴이(Sleep Keeper) was updated on November 7, 2026 and MOJO KING on November 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.*