# 天球模擬器 vs First Light

The clearest difference is update cadence: 天球模擬器 at every 3 days against First Light's every 3 weeks. 天球模擬器 also leads on device support (3 vs 1) and iOS requirement (13.0 vs 17.0). On price, 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.

天球模擬器 ships an update every 3 days, First Light every 3 weeks. The most recent releases landed on October 16, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | 天球模擬器 | First Light |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/first-light-cosmic-viewer/id6780022564/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 3 weeks |
| Monetization | — | Free |
| Size | 19 MB | 75 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Han-Chiang Chou](https://appshunter.io/developer/1883578938) | [Thomas Sola](https://appshunter.io/developer/6780022566) |

## What reviewers say

### 天球模擬器

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

**Features:** macOS Compatibility

**In-app purchases:** none


### First Light

[App page](https://appshunter.io/ios/app/first-light-cosmic-viewer/id6780022564)

Explore the universe's earliest light with real cosmic microwave background data. Pan across the oldest light in the universe, switch between satellites, and observe shifts in frequency bands. This educational app brings real science and cosmic history to your mobile device.

**Highlights:** Explore cosmic microwave background data, Immersive sky exploration via phone movement, Switch between COBE, WMAP, and Planck satellites, Adjust frequency bands to see universe shifts, Utilizes real scientific data

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

**In-app purchases:** none


## 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 First Light free?

First Light is free to download, with no in-app purchases.

### Do 天球模擬器 or First Light have ads?

Neither 天球模擬器 nor First Light shows ads.

### Which is updated more often, 天球模擬器 or First Light?

天球模擬器 ships an update every 3 days, and First Light every 3 weeks. Most recently, 天球模擬器 was updated on October 16, 2026 and First Light on October 15, 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.*