# 空の青さを知る vs Marika's DokiDoki Dungeon

The clearest difference is in-app purchases: 空の青さを知る at none against Marika's DokiDoki Dungeon's 1. 空の青さを知る also leads on ads (none vs shown). Marika's DokiDoki Dungeon's advantage is iOS requirement (13.0 vs 15.5). On price, update cadence and device support there is nothing between them.

Both are free to download. Marika's DokiDoki Dungeon sells 1 one-off in-app purchase. 空の青さを知る asks for nothing beyond the download.

空の青さを知る ships an update monthly, Marika's DokiDoki Dungeon every 2 months. Both last shipped on October 25, 2026.

## The numbers

| Metric | 空の青さを知る | Marika's DokiDoki Dungeon |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 2 months |
| Size | 86 MB | 28 MB |
| Requires iOS | 15.5 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [chiaki matsuda](https://appshunter.io/developer/1602664460) | [Mihoko Araki](https://appshunter.io/developer/1476136915) |

## What reviewers say

### 空の青さを知る

[App page](https://appshunter.io/ios/app/id1602664458)

**Features:** macOS Compatibility

**In-app purchases:** none


### Marika's DokiDoki Dungeon

[App page](https://appshunter.io/ios/app/marikas-dokidoki-dungeon/id1639529994)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads | $1.99 | one-time |


## Frequently asked questions

### Is 空の青さを知る free?

空の青さを知る is free to download, with no in-app purchases.

### Is Marika's DokiDoki Dungeon free?

Marika's DokiDoki Dungeon is free to download, with in-app purchases available.

### Do 空の青さを知る or Marika's DokiDoki Dungeon have ads?

Marika's DokiDoki Dungeon shows ads; 空の青さを知る does not.

### Which is updated more often, 空の青さを知る or Marika's DokiDoki Dungeon?

空の青さを知る ships an update monthly, and Marika's DokiDoki Dungeon every 2 months. Most recently, 空の青さを知る was updated on October 25, 2026 and Marika's DokiDoki Dungeon 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.*