# 睡眠精灵 vs 正反馈

The clearest difference is in-app purchases: 正反馈 at none against 睡眠精灵's 3. 睡眠精灵's advantage is iOS requirement (11.0 vs 16.0). On price, ads and device support there is nothing between them.

Both are free to download. 睡眠精灵 sells 3 in-app purchases, starting at $3.49 per month. 正反馈 asks for nothing beyond the download.

## The numbers

| Metric | 睡眠精灵 | 正反馈 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | — |
| Size | 66 MB | 1 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [长沙年余信息科技有限公司](https://appshunter.io/developer/1469330214) | [继愉 陶](https://appshunter.io/developer/6789787343) |

## What reviewers say

### 睡眠精灵

[App page](https://appshunter.io/ios/app/id1473217152)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP包月 | $3.49 | per month |
| VIP包季 | $7.99 | per 3 months |
| VIP包年 | $28.99 | per year |


### 正反馈

[App page](https://appshunter.io/ios/app/id6499565417)

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

**In-app purchases:** none


## Frequently asked questions

### Is 睡眠精灵 free?

睡眠精灵 is free to download, with in-app purchases available.

### Is 正反馈 free?

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

### Do 睡眠精灵 or 正反馈 have ads?

Neither 睡眠精灵 nor 正反馈 shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*