# 天球模擬器 vs COSMOS

The clearest difference is in-app purchases: 天球模擬器 at none against COSMOS's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. COSMOS sells 1 one-off in-app purchase. 天球模擬器 asks for nothing beyond the download.

## The numbers

| Metric | 天球模擬器 | COSMOS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 days | — |
| Size | 19 MB | 27 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Han-Chiang Chou](https://appshunter.io/developer/1883578938) | [Muhammed Celik](https://appshunter.io/developer/1885092121) |

## What reviewers say

### 天球模擬器

[App page](https://appshunter.io/ios/app/id6760458030)

**Features:** macOS Compatibility

**In-app purchases:** none


### COSMOS

[App page](https://appshunter.io/ios/app/cosmos-solar-system-explorer/id6773522707)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| COSMOS Premium | $4.99 | one-time |


## Frequently asked questions

### Is 天球模擬器 free?

天球模擬器 is free to download, with no in-app purchases.

### Is COSMOS free?

COSMOS is free to download, with in-app purchases available.

### Do 天球模擬器 or COSMOS have ads?

Neither 天球模擬器 nor COSMOS shows ads.

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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.*