# MusterSleep vs 易私慕电子签

The clearest difference is update cadence: MusterSleep at every 4 weeks against 易私慕电子签's every 3 months. MusterSleep also leads on iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

MusterSleep ships an update every 4 weeks, 易私慕电子签 every 3 months. The most recent releases landed on October 1, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | MusterSleep | 易私慕电子签 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 3 months |
| Size | 40 MB | 32 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Keeson Technology Corporation Limited](https://appshunter.io/developer/1561275126) | [上海美市科技有限公司](https://appshunter.io/developer/1058252533) |

## What reviewers say

### MusterSleep

[App page](https://appshunter.io/ios/app/mustersleep/id6743064673)

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

**In-app purchases:** none


### 易私慕电子签

[App page](https://appshunter.io/ios/app/id6745494343)

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

**In-app purchases:** none


## Frequently asked questions

### Is MusterSleep free?

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

### Is 易私慕电子签 free?

易私慕电子签 is free to download, with no in-app purchases.

### Do MusterSleep or 易私慕电子签 have ads?

Neither MusterSleep nor 易私慕电子签 shows ads.

### Which is updated more often, MusterSleep or 易私慕电子签?

MusterSleep ships an update every 4 weeks, and 易私慕电子签 every 3 months. Most recently, MusterSleep was updated on October 1, 2026 and 易私慕电子签 on October 7, 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.*