# 블루체크 vs 펜팔, 편지 친구

The clearest difference is update cadence: 블루체크 at every 4 days against 펜팔, 편지 친구's fortnightly. On ads, in-app purchases, device support and iOS requirement there is nothing between them.

블루체크 ships an update every 4 days, 펜팔, 편지 친구 fortnightly. Both last shipped on October 28, 2026.

## The numbers

| Metric | 블루체크 | 펜팔, 편지 친구 |
| --- | --- | --- |
| Price | **Free** | — |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/id6770534229/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 74 MB | 7 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [TripleAuth](https://appshunter.io/developer/1812844883) | [JINWOOK CHUNG](https://appshunter.io/developer/1896751459) |

## What reviewers say

### 블루체크

[App page](https://appshunter.io/ios/app/sns/id6755992194)

**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:** none


## Frequently asked questions

### Is 블루체크 free?

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

### Is 펜팔, 편지 친구 free?

Pricing for 펜팔, 편지 친구 is not currently listed on the App Store.

### Do 블루체크 or 펜팔, 편지 친구 have ads?

Neither 블루체크 nor 펜팔, 편지 친구 shows ads.

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

블루체크 ships an update every 4 days, and 펜팔, 편지 친구 fortnightly. Most recently, 블루체크 was updated on October 28, 2026 and 펜팔, 편지 친구 on October 28, 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.*