# Memo@21KG vs Queen’s Castle Learning 皇皓教育

The clearest difference is update cadence: Memo@21KG at every 3 days against Queen’s Castle Learning 皇皓教育's every 2 months. Memo@21KG also leads on iOS requirement (9.0 vs 12.0). 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.

Memo@21KG ships an update every 3 days, Queen’s Castle Learning 皇皓教育 every 2 months. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Memo@21KG | Queen’s Castle Learning 皇皓教育 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 2 months |
| Size | 47 MB | 19 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KanHan Technologies Limited](https://appshunter.io/developer/391717912) | [Dreamware Limited](https://appshunter.io/developer/892413586) |

## What reviewers say

### Memo@21KG

[App page](https://appshunter.io/ios/app/memo21kg/id1335935383)

**Features:** macOS Compatibility

**In-app purchases:** none


### Queen’s Castle Learning 皇皓教育

[App page](https://appshunter.io/ios/app/queens-castle-learning/id1546596903)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Memo@21KG free?

Memo@21KG is free to download, with no in-app purchases.

### Is Queen’s Castle Learning 皇皓教育 free?

Queen’s Castle Learning 皇皓教育 is free to download, with no in-app purchases.

### Do Memo@21KG or Queen’s Castle Learning 皇皓教育 have ads?

Neither Memo@21KG nor Queen’s Castle Learning 皇皓教育 shows ads.

### Which is updated more often, Memo@21KG or Queen’s Castle Learning 皇皓教育?

Memo@21KG ships an update every 3 days, and Queen’s Castle Learning 皇皓教育 every 2 months. Most recently, Memo@21KG was updated on October 26, 2026 and Queen’s Castle Learning 皇皓教育 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.*