# 51知灾害 vs 天气圈

The clearest difference is update cadence: 天气圈 at every 3 weeks against 51知灾害's every 4 months. 51知灾害's advantage is iOS requirement (9.0 vs 13.0). 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知灾害 ships an update every 4 months, 天气圈 every 3 weeks. The most recent releases landed on October 9, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | 51知灾害 | 天气圈 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 53 MB | 76 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [钦荣 翁](https://appshunter.io/developer/1278827536) | [健 陈](https://appshunter.io/developer/1129782902) |

## What reviewers say

### 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


### 天气圈

[App page](https://appshunter.io/ios/app/id6445831670)

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

**In-app purchases:** none


## Frequently asked questions

### Is 51知灾害 free?

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

### Is 天气圈 free?

天气圈 is free to download, with no in-app purchases.

### Do 51知灾害 or 天气圈 have ads?

Neither 51知灾害 nor 天气圈 shows ads.

### Which is updated more often, 51知灾害 or 天气圈?

51知灾害 ships an update every 4 months, and 天气圈 every 3 weeks. Most recently, 51知灾害 was updated on October 9, 2026 and 天气圈 on October 4, 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.*