# 知天气 vs Blue Map

The clearest difference is rating: Blue Map at 5.0 against 知天气's 4.3. Blue Map also leads on update cadence (every 2 weeks vs every 2 months). 知天气's advantage is review sentiment (80% vs 71%) and iOS requirement (11.0 vs 15). On price, ratings volume, 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.

Blue Map holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews complicate that: 80% of 知天气's written reviews are positive against 71% of Blue Map's, so the app with the better star average is not the one people write more warmly about.

知天气 ships an update every 2 months, Blue Map every 2 weeks. The most recent releases landed on September 23, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | 知天气 | Blue Map |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (3 ratings)](https://appshunter.io/ios/app/id451961462/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/blue-map/id838211758/reviews)** |
| Number of ratings | **3** | 2 |
| Positive reviews | **80.0% of reviews** | 71.2% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 137 MB | 127 MB |
| Requires iOS | **11.0** | 15 |
| Devices | iPhone, iPod | **iPhone, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [炳阳 林](https://appshunter.io/developer/449564435) | [北京市朝阳区公众环境研究中心](https://appshunter.io/developer/838211761) |

## What reviewers say

### 知天气

[App page](https://appshunter.io/ios/app/id451961462)

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

**In-app purchases:** none


### Blue Map

[App page](https://appshunter.io/ios/app/blue-map/id838211758)

Access global environmental data, including air and water quality, corporate emissions, and ecological information. Participate in environmental protection by reporting pollution, sharing data, and tracking your low-carbon actions. Visualize environmental conditions with interactive maps and receive AI-driven insights and health alerts.

**Highlights:** Real-time environmental quality data, Corporate emissions and performance tracking, Public pollution reporting and action, Interactive environmental maps, AI-powered data insights, Personalized health and environmental alerts

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 知天气 free?

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

### Is Blue Map free?

Blue Map is free to download, with no in-app purchases.

### Which has better reviews, 知天气 or Blue Map?

Blue Map is rated higher. 知天气 averages 4.3 out of 5 from 3 ratings, while Blue Map averages 5.0 from 2 ratings.

### Do 知天气 or Blue Map have ads?

Neither 知天气 nor Blue Map shows ads.

### Which is updated more often, 知天气 or Blue Map?

知天气 ships an update every 2 months, and Blue Map every 2 weeks. Most recently, 知天气 was updated on September 23, 2026 and Blue Map on September 27, 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.*