# 51大师兄 vs 企业数字服务

The clearest difference is in-app purchases: 企业数字服务 at none against 51大师兄's 10. 企业数字服务 also leads on ads (none vs shown). 51大师兄's advantage is update cadence (every 2 weeks vs every 2 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 51大师兄 sells 10 one-off in-app purchases. 企业数字服务 asks for nothing beyond the download.

51大师兄 ships an update every 2 weeks, 企业数字服务 every 2 months. The most recent releases landed on October 27, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | 51大师兄 | 企业数字服务 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Size | 339 MB | 91 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Big Brother Shanghai Cloud Data Service Co., Ltd](https://appshunter.io/developer/1533046678) | [SI-TECH Information Technology Ltd.](https://appshunter.io/developer/448117246) |

## What reviewers say

### 51大师兄

[App page](https://appshunter.io/ios/app/51-ai/id1533046676)

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1个月普通大师兄会员 | $7.99 | one-time |
| 3个月普通大师兄会员 | $19.99 | one-time |
| 3个月普通大师兄会员 | $20.99 | one-time |
| 6个月金牌大师兄会员 | $45.99 | one-time |
| 1年普通大师兄会员 | $59.99 | one-time |
| 1年金牌大师兄会员 | $74.99 | one-time |
| 1年普通大师兄会员 | $79.99 | one-time |
| 1年金牌大师兄会员 | $79.99 | one-time |
| 1年钻石大师兄会员 | $79.99 | one-time |
| 1年钻石大师兄会员 | $89.99 | one-time |


### 企业数字服务

[App page](https://appshunter.io/ios/app/id6444465923)

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

**In-app purchases:** none


## Frequently asked questions

### Is 51大师兄 free?

51大师兄 is free to download, with in-app purchases available.

### Is 企业数字服务 free?

企业数字服务 is free to download, with no in-app purchases.

### Do 51大师兄 or 企业数字服务 have ads?

51大师兄 shows ads; 企业数字服务 does not.

### Which is updated more often, 51大师兄 or 企业数字服务?

51大师兄 ships an update every 2 weeks, and 企业数字服务 every 2 months. Most recently, 51大师兄 was updated on October 27, 2026 and 企业数字服务 on October 11, 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.*