# 뇌남사 vs 펜팔, 편지 친구

The clearest difference is in-app purchases: 뇌남사 at none against 펜팔, 편지 친구's 2. 뇌남사 also leads on review sentiment (100% vs 67%) and update cadence (every 3 days vs fortnightly). 펜팔, 편지 친구's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 펜팔, 편지 친구 sells 2 one-off in-app purchases. 뇌남사 asks for nothing beyond the download.

뇌남사 ships an update every 3 days, 펜팔, 편지 친구 fortnightly. The most recent releases landed on November 5, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | 뇌남사 | 펜팔, 편지 친구 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **100.0% of reviews** | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Fortnightly |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 40 MB | 7 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 17+ |
| Developer | [Dongmin Kim](https://appshunter.io/developer/1892347954) | [JINWOOK CHUNG](https://appshunter.io/developer/1896751459) |

## What reviewers say

### 뇌남사

[App page](https://appshunter.io/ios/app/id6761993774)

Engage in deep discussions and share unique perspectives on various topics. This platform allows you to build your 'thinking muscles' by participating in debates and connecting with diverse viewpoints.

**Highlights:** Interest-based discussion rooms, Real-time trend feed, Continuous participation system for intellectual growth, Private rooms for intimate conversations, Easy social sharing

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

**In-app purchases:** none


### 펜팔, 편지 친구

[App page](https://appshunter.io/ios/app/id6770534229)

This app fosters deeper connections through slow communication, focusing on written messages and a 6-hour delivery time for letters. It encourages sharing daily thoughts and finding like-minded individuals in a safe, respectful environment.

**Highlights:** Daily journaling with 'Today's Writing', 6-hour delayed letter delivery, Slow, thoughtful communication, Safe and curated interactions, Connect through shared thoughts and feelings

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 우표 2장 | $0.49 | one-time |
| 우표 10장 | $1.99 | one-time |


## Frequently asked questions

### Is 뇌남사 free?

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

### Is 펜팔, 편지 친구 free?

펜팔, 편지 친구 is free to download, with in-app purchases available.

### Do 뇌남사 or 펜팔, 편지 친구 have ads?

뇌남사 shows ads; 펜팔, 편지 친구 does not.

### Which is updated more often, 뇌남사 or 펜팔, 편지 친구?

뇌남사 ships an update every 3 days, and 펜팔, 편지 친구 fortnightly. Most recently, 뇌남사 was updated on November 5, 2026 and 펜팔, 편지 친구 on November 9, 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.*