# 天文大师 vs 嗖嗖Fly

The clearest difference is ads: 天文大师 at none against 嗖嗖Fly's shown. 天文大师 also leads on iOS requirement (11.0 vs 15.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

天文大师 ships an update every 8 days, 嗖嗖Fly fortnightly. Both last shipped on October 27, 2026.

## The numbers

| Metric | 天文大师 | 嗖嗖Fly |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fly/id6708228548/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 8 days** | Fortnightly |
| Monetization | — | Free |
| Size | 92 MB | 129 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [文 段](https://appshunter.io/developer/598835218) | [北京安擎智飞科技有限公司](https://appshunter.io/developer/1769867334) |

## What reviewers say

### 天文大师

[App page](https://appshunter.io/ios/app/id1636292116)

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

**In-app purchases:** none


### 嗖嗖Fly

[App page](https://appshunter.io/ios/app/fly/id6708228548)

This app uses advanced algorithms to scan the sky and identify satellite orbits in real-time. It offers a 3D visualization of constellations and allows users to generate personalized posters of their findings. It's designed for users interested in space technology and celestial observation.

**Highlights:** One-click sky scanning, Real-time satellite orbit tracking, 3D constellation visualization, Personalized 'sky scan' posters, Integration with Beidou/GPS data, Optimized scanning algorithms

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

**In-app purchases:** none


## Frequently asked questions

### Is 天文大师 free?

天文大师 is free to download, with no in-app purchases.

### Is 嗖嗖Fly free?

嗖嗖Fly is free to download, with no in-app purchases.

### Do 天文大师 or 嗖嗖Fly have ads?

嗖嗖Fly shows ads; 天文大师 does not.

### Which is updated more often, 天文大师 or 嗖嗖Fly?

天文大师 ships an update every 8 days, and 嗖嗖Fly fortnightly. Most recently, 天文大师 was updated on October 27, 2026 and 嗖嗖Fly on October 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.*