# 追风助手 vs 51知灾害

The clearest difference is review sentiment: 追风助手 at 89% against 51知灾害's 0%. 51知灾害's advantage is ads (none vs shown) and update cadence (every 4 months vs every 18 months). On price, 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.

追风助手 ships an update every 18 months, 51知灾害 every 4 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 追风助手 | 51知灾害 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/id733242153/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | **88.9% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 18 months | **Every 4 months** |
| Monetization | — | Free |
| Size | 37 MB | 53 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [志凡 周](https://appshunter.io/developer/647510602) | [钦荣 翁](https://appshunter.io/developer/1278827536) |

## What reviewers say

### 追风助手

[App page](https://appshunter.io/ios/app/id733242153)

**Features:** Vision Pro support

**In-app purchases:** none


### 51知灾害

[App page](https://appshunter.io/ios/app/51/id1592935902)

This application provides comprehensive professional service modules. It has been comprehensively upgraded to offer enhanced functionality and user experience.

**Highlights:** Comprehensive professional service modules, Upgraded functionality, Enhanced user experience, Weather information services

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

**In-app purchases:** none


## Frequently asked questions

### Is 追风助手 free?

追风助手 is free to download, with no in-app purchases.

### Is 51知灾害 free?

51知灾害 is free to download, with no in-app purchases.

### Do 追风助手 or 51知灾害 have ads?

追风助手 shows ads; 51知灾害 does not.

### Which is updated more often, 追风助手 or 51知灾害?

追风助手 ships an update every 18 months, and 51知灾害 every 4 months. Most recently, 追风助手 was updated on October 23, 2026 and 51知灾害 on October 24, 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.*