# M21 vs 六鸭Gaa

M21 and 六鸭Gaa are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

M21 ships an update every 5 weeks, 六鸭Gaa every 3 weeks. The most recent releases landed on October 4, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | M21 | 六鸭Gaa |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Size | 65 MB | 84 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 9+ | 17+ |
| Developer | [广州惟为网络科技有限公司](https://appshunter.io/developer/1000338390) | [Wuhan October Technology Co.,Ltd](https://appshunter.io/developer/1570393831) |

## What reviewers say

### M21

[App page](https://appshunter.io/ios/app/m21-3x/id1178637217)

**In-app purchases:** none


### 六鸭Gaa

[App page](https://appshunter.io/ios/app/gaa/id6618146167)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is M21 free?

M21 is free to download, with no in-app purchases.

### Is 六鸭Gaa free?

六鸭Gaa is free to download, with no in-app purchases.

### Do M21 or 六鸭Gaa have ads?

Neither M21 nor 六鸭Gaa shows ads.

### Which is updated more often, M21 or 六鸭Gaa?

M21 ships an update every 5 weeks, and 六鸭Gaa every 3 weeks. Most recently, M21 was updated on October 4, 2026 and 六鸭Gaa on October 14, 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.*