# AELOS STEM vs 毛选

The clearest difference is price: AELOS STEM at Free against 毛选's $2.99. AELOS STEM also leads on device support (3 vs 1) and iOS requirement (8.0 vs 16.0). 毛选's advantage is update cadence (every 3 days vs every 3 months). On ads and in-app purchases there is nothing between them.

AELOS STEM is free to download; 毛选 costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

AELOS STEM ships an update every 3 months, 毛选 every 3 days. The most recent releases landed on October 4, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | AELOS STEM | 毛选 |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Positive reviews | — | 87.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 days** |
| Size | 97 MB | 149 MB |
| Requires iOS | **8.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Leju(Shenzhen) Robot Technology CO., Ltd](https://appshunter.io/developer/1133429668) | [Powerless Co., Ltd](https://appshunter.io/developer/1738728750) |

## What reviewers say

### AELOS STEM

[App page](https://appshunter.io/ios/app/aelos-stem/id1335859984)

**Features:** macOS Compatibility

**In-app purchases:** none


### 毛选

[App page](https://appshunter.io/ios/app/id6772181771)

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

**In-app purchases:** none


## Frequently asked questions

### Is AELOS STEM free?

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

### Is 毛选 free?

毛选 costs $2.99, with no in-app purchases.

### Do AELOS STEM or 毛选 have ads?

Neither AELOS STEM nor 毛选 shows ads.

### Which is updated more often, AELOS STEM or 毛选?

AELOS STEM ships an update every 3 months, and 毛选 every 3 days. Most recently, AELOS STEM was updated on October 4, 2026 and 毛选 on October 16, 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.*