# 广东省空气质量实况与预报手机发布系统Pub vs US Tide Charts

The clearest difference is in-app purchases: 广东省空气质量实况与预报手机发布系统Pub at none against US Tide Charts's 2. 广东省空气质量实况与预报手机发布系统Pub also leads on ads (none vs shown) and iOS requirement (7.0 vs 15.0). On price, update cadence and device support there is nothing between them.

Both are free to download. US Tide Charts sells 2 in-app purchases, starting at $4.99 per month. 广东省空气质量实况与预报手机发布系统Pub asks for nothing beyond the download.

广东省空气质量实况与预报手机发布系统Pub ships an update every 3 months, US Tide Charts every 2 months. The most recent releases landed on November 3, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | 广东省空气质量实况与预报手机发布系统Pub | US Tide Charts |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 months** |
| Size | 29 MB | 85 MB |
| Requires iOS | **7.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [广东旭诚科技有限公司](https://appshunter.io/developer/1048882371) | [kota tada](https://appshunter.io/developer/1658942612) |

## What reviewers say

### 广东省空气质量实况与预报手机发布系统Pub

[App page](https://appshunter.io/ios/app/pub/id1477157378)

**Features:** Vision Pro support

**In-app purchases:** none


### US Tide Charts

[App page](https://appshunter.io/ios/app/us-tide-charts-marevia/id6797709399)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (1 month) | $4.99 | per month |
| Premium (1 year) | $49.99 | per year |


## Frequently asked questions

### Is 广东省空气质量实况与预报手机发布系统Pub free?

广东省空气质量实况与预报手机发布系统Pub is free to download, with no in-app purchases.

### Is US Tide Charts free?

US Tide Charts is free to download, with in-app purchases available.

### Do 广东省空气质量实况与预报手机发布系统Pub or US Tide Charts have ads?

US Tide Charts shows ads; 广东省空气质量实况与预报手机发布系统Pub does not.

### Which is updated more often, 广东省空气质量实况与预报手机发布系统Pub or US Tide Charts?

广东省空气质量实况与预报手机发布系统Pub ships an update every 3 months, and US Tide Charts every 2 months. Most recently, 广东省空气质量实况与预报手机发布系统Pub was updated on November 3, 2026 and US Tide Charts on November 6, 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.*