# BisonAuthy vs 天文观测

The clearest difference is in-app purchases: BisonAuthy at none against 天文观测's 1. 天文观测's advantage is iOS requirement (15.6 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 天文观测 sells 1 in-app purchase, starting at $1.99 per 7 days. BisonAuthy asks for nothing beyond the download.

BisonAuthy ships an update every 3 weeks, 天文观测 fortnightly. The most recent releases landed on October 25, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | BisonAuthy | 天文观测 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Size | 5 MB | 32 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [B&A Group Limited](https://appshunter.io/developer/1821851165) | [燕燕 林](https://appshunter.io/developer/1675436596) |

## What reviewers say

### BisonAuthy

[App page](https://appshunter.io/ios/app/bisonauthy/id6499211300)

**Features:** macOS Compatibility

**In-app purchases:** none


### 天文观测

[App page](https://appshunter.io/ios/app/id6756773180)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 天文观测尊贵会员 | $1.99 | per 7 days |


## Frequently asked questions

### Is BisonAuthy free?

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

### Is 天文观测 free?

天文观测 is free to download, with in-app purchases available.

### Do BisonAuthy or 天文观测 have ads?

Neither BisonAuthy nor 天文观测 shows ads.

### Which is updated more often, BisonAuthy or 天文观测?

BisonAuthy ships an update every 3 weeks, and 天文观测 fortnightly. Most recently, BisonAuthy was updated on October 25, 2026 and 天文观测 on October 13, 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.*