# 51教练助手 vs 百川云磁

The clearest difference is update cadence: 百川云磁 at every 11 days against 51教练助手's every 3 weeks. 51教练助手's advantage is iOS requirement (8.0 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.

51教练助手 ships an update every 3 weeks, 百川云磁 every 11 days. The most recent releases landed on September 25, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | 51教练助手 | 百川云磁 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 11 days** |
| Size | 50 MB | 162 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [增长 黄](https://appshunter.io/developer/789260887) | [Shenzhen Xi'an Shuke Technology Co., Ltd.](https://appshunter.io/developer/1773334900) |

## What reviewers say

### 51教练助手

[App page](https://appshunter.io/ios/app/51/id807921122)

**Features:** macOS Compatibility

**In-app purchases:** none


### 百川云磁

[App page](https://appshunter.io/ios/app/id6736795281)

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

**In-app purchases:** none


## Frequently asked questions

### Is 51教练助手 free?

51教练助手 is free to download, with no in-app purchases.

### Is 百川云磁 free?

百川云磁 is free to download, with no in-app purchases.

### Do 51教练助手 or 百川云磁 have ads?

Neither 51教练助手 nor 百川云磁 shows ads.

### Which is updated more often, 51教练助手 or 百川云磁?

51教练助手 ships an update every 3 weeks, and 百川云磁 every 11 days. Most recently, 51教练助手 was updated on September 25, 2026 and 百川云磁 on October 5, 2026.

---

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