# HELLO地球（郑州图书馆） vs 北斗知识星球

The clearest difference is in-app purchases: HELLO地球（郑州图书馆） at none against 北斗知识星球's 1. HELLO地球（郑州图书馆） also leads on device support and iOS requirement (7.0 vs 11.0). On price there is nothing between them.

Both are free to download. 北斗知识星球 sells 1 one-off in-app purchase. HELLO地球（郑州图书馆） asks for nothing beyond the download.

## The numbers

| Metric | HELLO地球（郑州图书馆） | 北斗知识星球 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | — |
| Size | 626 MB | 822 MB |
| Requires iOS | **7.0** | 11.0 |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [Beijing Vivabro Technology Co.,Ltd.](https://appshunter.io/developer/1086003901) | [Beijing Dipper Publishing Co., Ltd.](https://appshunter.io/developer/1465064938) |

## What reviewers say

### HELLO地球（郑州图书馆）

[App page](https://appshunter.io/ios/app/hello/id1448085093)

**In-app purchases:** none


### 北斗知识星球

[App page](https://appshunter.io/ios/app/id6550893575)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 地球仪图片 | Free | one-time |


## Frequently asked questions

### Is HELLO地球（郑州图书馆） free?

HELLO地球（郑州图书馆） is free to download, with no in-app purchases.

### Is 北斗知识星球 free?

北斗知识星球 is free to download, with in-app purchases available.

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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.*