# 双工服务系统 vs 拾音螺

The clearest difference is in-app purchases: 双工服务系统 at none against 拾音螺's 3. 拾音螺's advantage is device support. On price and iOS requirement there is nothing between them.

Both are free to download. 拾音螺 sells 3 in-app purchases, starting at $0.99 per 7 days. 双工服务系统 asks for nothing beyond the download.

## The numbers

| Metric | 双工服务系统 | 拾音螺 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | — | Fortnightly |
| Size | 29 MB | 41 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | — | **iPhone, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [深圳市博纳德信息技术有限公司](https://appshunter.io/developer/1209441204) | [广州策翁企业管理咨询有限公司](https://appshunter.io/developer/1720686636) |

## What reviewers say

### 双工服务系统

[App page](https://appshunter.io/ios/app/id6458691439)

**In-app purchases:** none


### 拾音螺

[App page](https://appshunter.io/ios/app/id6478998431)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 7天会员权益 | $0.99 | per 7 days |
| 30天SVIP权益 | $2.99 | per month |
| 365天SVIP | $19.99 | per year |


## Frequently asked questions

### Is 双工服务系统 free?

双工服务系统 is free to download, with no in-app purchases.

### Is 拾音螺 free?

拾音螺 is free to download, with in-app purchases available.

---

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