# 51教练助手 vs OD Link系统

The clearest difference is iOS requirement: 51教练助手 at 8.0 against OD Link系统's 15.0. On price, update cadence, ads and in-app purchases 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, OD Link系统 monthly. The most recent releases landed on October 11, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | 51教练助手 | OD Link系统 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Size | 50 MB | 56 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) | [ChengLu Education Technology (Hubei) Co., Ltd.](https://appshunter.io/developer/1557843667) |

## What reviewers say

### 51教练助手

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

**Features:** macOS Compatibility

**In-app purchases:** none


### OD Link系统

[App page](https://appshunter.io/ios/app/od-link/id1633922510)

**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 OD Link系统 free?

OD Link系统 is free to download, with no in-app purchases.

### Do 51教练助手 or OD Link系统 have ads?

Neither 51教练助手 nor OD Link系统 shows ads.

### Which is updated more often, 51教练助手 or OD Link系统?

51教练助手 ships an update every 3 weeks, and OD Link系统 monthly. Most recently, 51教练助手 was updated on October 11, 2026 and OD Link系统 on October 19, 2026.

---

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