# J55Xデータ管理 vs Sleep Sounds

The clearest difference is in-app purchases: J55Xデータ管理 at none against Sleep Sounds's 4. J55Xデータ管理 also leads on iOS requirement (13.0 vs 16.6). Sleep Sounds's advantage is update cadence (every 10 days vs every 24 months). On price, ads and device support there is nothing between them.

Both are free to download. Sleep Sounds sells 4 in-app purchases, starting at $1.99 per 7 days. J55Xデータ管理 asks for nothing beyond the download.

J55Xデータ管理 ships an update every 24 months, Sleep Sounds every 10 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | J55Xデータ管理 | Sleep Sounds |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/sleep-sounds-sleepmaker/id6747245325/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 10 days** |
| Monetization | — | Freemium |
| Size | 10 MB | 36 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [WORK JOY, CO.,LTD.](https://appshunter.io/developer/1456702871) | [MOBILE ALCHEMY LTD](https://appshunter.io/developer/1577973502) |

## What reviewers say

### J55Xデータ管理

[App page](https://appshunter.io/ios/app/j55x/id1456702872)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sleep Sounds

[App page](https://appshunter.io/ios/app/sleep-sounds-sleepmaker/id6747245325)

Drift off to sleep with a vast library of calming sounds, including white noise, nature soundscapes, and ambient tones. Create custom mixes, utilize a smart sleep timer, and enjoy background playback for uninterrupted relaxation.

**Highlights:** Real-time synthesized noise generator, Extensive library of nature and ambient sounds, Customizable sound mix builder, Sleep timer with fade-out functionality, Background playback, Offline sound downloads, Apple Watch companion app

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Monthly | $5.99 | per month |
| Yearly | $39.99 | per year |
| Yearly with Family Sharing | $59.99 | per year |


## Frequently asked questions

### Is J55Xデータ管理 free?

J55Xデータ管理 is free to download, with no in-app purchases.

### Is Sleep Sounds free?

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

### Do J55Xデータ管理 or Sleep Sounds have ads?

Neither J55Xデータ管理 nor Sleep Sounds shows ads.

### Which is updated more often, J55Xデータ管理 or Sleep Sounds?

J55Xデータ管理 ships an update every 24 months, and Sleep Sounds every 10 days. Most recently, J55Xデータ管理 was updated on November 2, 2026 and Sleep Sounds 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.*