# 밤편지 AI vs 루딘프

The clearest difference is ads: 루딘프 at none against 밤편지 AI's shown. 루딘프 also leads on update cadence (every 11 days vs monthly) and iOS requirement (13.0 vs 15.0). On price, 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.

밤편지 AI ships an update monthly, 루딘프 every 11 days. The most recent releases landed on October 6, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | 밤편지 AI | 루딘프 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 11 days** |
| Size | 24 MB | 60 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [JUNTAE J SON](https://appshunter.io/developer/1862957512) | [Seung Hyun Oh](https://appshunter.io/developer/1896164753) |

## What reviewers say

### 밤편지 AI

[App page](https://appshunter.io/ios/app/ai/id6761960626)

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

**In-app purchases:** none


### 루딘프

[App page](https://appshunter.io/ios/app/ai/id6766019247)

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

**In-app purchases:** none


## Frequently asked questions

### Is 밤편지 AI free?

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

### Is 루딘프 free?

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

### Do 밤편지 AI or 루딘프 have ads?

밤편지 AI shows ads; 루딘프 does not.

### Which is updated more often, 밤편지 AI or 루딘프?

밤편지 AI ships an update monthly, and 루딘프 every 11 days. Most recently, 밤편지 AI was updated on October 6, 2026 and 루딘프 on October 15, 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.*