# 청구박사 vs PDF Reader

The clearest difference is ads: 청구박사 at none against PDF Reader's shown. 청구박사 also leads on iOS requirement (12.0 vs 16). On price, update cadence, 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.

청구박사 ships an update every 10 days, PDF Reader every 6 days. The most recent releases landed on October 10, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | 청구박사 | PDF Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (64 ratings)](https://appshunter.io/ios/app/pdf-reader-viewer/id6746119431/reviews)** |
| Number of ratings | — | **64** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 10 days | **Every 6 days** |
| Monetization | — | Ad-supported |
| Size | 33 MB | 116 MB |
| Requires iOS | **12.0** | 16 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Kyoungwon Lee](https://appshunter.io/developer/1812453576) | [All About Housing LLC](https://appshunter.io/developer/1773925650) |

## What reviewers say

### 청구박사

[App page](https://appshunter.io/ios/app/id6745481601)

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

**In-app purchases:** none


### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-viewer/id6746119431)

This app provides a privacy-focused way to view, organize, and manage PDF files on your device. It offers tools for merging, splitting, securing documents, and converting images to PDF, all processed locally for enhanced data safety.

**Highlights:** View and organize PDF files, Merge and split PDFs, Secure documents with passwords, Convert images to PDF, Built-in document scanner, Local data processing for privacy

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

**In-app purchases:** none


## Frequently asked questions

### Is 청구박사 free?

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

### Is PDF Reader free?

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

### Do 청구박사 or PDF Reader have ads?

PDF Reader shows ads; 청구박사 does not.

### Which is updated more often, 청구박사 or PDF Reader?

청구박사 ships an update every 10 days, and PDF Reader every 6 days. Most recently, 청구박사 was updated on October 10, 2026 and PDF Reader on October 3, 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.*