# 知微宇宙 AstroPearl vs Erosion 蚀

The clearest difference is update cadence: Erosion 蚀 at fortnightly against 知微宇宙 AstroPearl's every 5 weeks. 知微宇宙 AstroPearl's advantage is iOS requirement (15.1 vs 17.6). On price, ads, 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.

知微宇宙 AstroPearl ships an update every 5 weeks, Erosion 蚀 fortnightly. Both last shipped on October 25, 2026.

## The numbers

| Metric | 知微宇宙 AstroPearl | Erosion 蚀 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Size | 614 MB | 1 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Sanwu Yaofa Technology Limited.](https://appshunter.io/developer/1818322110) | [名哲 张](https://appshunter.io/developer/1879661087) |

## What reviewers say

### 知微宇宙 AstroPearl

[App page](https://appshunter.io/ios/app/astropearl/id6746753340)

**In-app purchases:** none


### Erosion 蚀

[App page](https://appshunter.io/ios/app/erosion/id6761682068)

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

**In-app purchases:** none


## Frequently asked questions

### Is 知微宇宙 AstroPearl free?

知微宇宙 AstroPearl is free to download, with no in-app purchases.

### Is Erosion 蚀 free?

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

### Do 知微宇宙 AstroPearl or Erosion 蚀 have ads?

Neither 知微宇宙 AstroPearl nor Erosion 蚀 shows ads.

### Which is updated more often, 知微宇宙 AstroPearl or Erosion 蚀?

知微宇宙 AstroPearl ships an update every 5 weeks, and Erosion 蚀 fortnightly. Most recently, 知微宇宙 AstroPearl was updated on October 25, 2026 and Erosion 蚀 on October 25, 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.*