# 잘자, 수면에 특화된 음악 및 가이드 앱 vs while you were sleeping

The clearest difference is in-app purchases: while you were sleeping at none against 잘자, 수면에 특화된 음악 및 가이드 앱's 4. while you were sleeping also leads on update cadence (weekly vs every 2 months). 잘자, 수면에 특화된 음악 및 가이드 앱's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 17.0). On price and ads there is nothing between them.

Both are free to download. 잘자, 수면에 특화된 음악 및 가이드 앱 sells 4 in-app purchases, starting at $2.99 per month. while you were sleeping asks for nothing beyond the download.

잘자, 수면에 특화된 음악 및 가이드 앱 ships an update every 2 months, while you were sleeping weekly. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | 잘자, 수면에 특화된 음악 및 가이드 앱 | while you were sleeping |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Size | 56 MB | 304 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sound Platform Co., Ltd.](https://appshunter.io/developer/1601753261) | [(주)허니냅스 (Honeynaps Co., Ltd.)](https://appshunter.io/developer/1192105907) |

## What reviewers say

### 잘자, 수면에 특화된 음악 및 가이드 앱

[App page](https://appshunter.io/ios/app/id6446684455)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium Membership | $2.99 | per month |
| Yearly Premium Membership | $22.99 | per year |
| Zalza 7 days Ticket | $0.99 | one-time |
| Zalza 30 days Ticket | $1.99 | one-time |


### while you were sleeping

[App page](https://appshunter.io/ios/app/while-you-were-sleeping/id6593683907)

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

**In-app purchases:** none


## Frequently asked questions

### Is 잘자, 수면에 특화된 음악 및 가이드 앱 free?

잘자, 수면에 특화된 음악 및 가이드 앱 is free to download, with in-app purchases available.

### Is while you were sleeping free?

while you were sleeping is free to download, with no in-app purchases.

### Do 잘자, 수면에 특화된 음악 및 가이드 앱 or while you were sleeping have ads?

Neither 잘자, 수면에 특화된 음악 및 가이드 앱 nor while you were sleeping shows ads.

### Which is updated more often, 잘자, 수면에 특화된 음악 및 가이드 앱 or while you were sleeping?

잘자, 수면에 특화된 음악 및 가이드 앱 ships an update every 2 months, and while you were sleeping weekly. Most recently, 잘자, 수면에 특화된 음악 및 가이드 앱 was updated on November 3, 2026 and while you were sleeping on November 4, 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.*