# Lu Reader vs Chaeksum

The clearest difference is in-app purchases: Lu Reader at none against Chaeksum's 4. Lu Reader also leads on iOS requirement (15.5 vs 17.4). Chaeksum's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Chaeksum sells 4 one-off in-app purchases. Lu Reader asks for nothing beyond the download.

Lu Reader ships an update every 4 days, Chaeksum every 3 days. The most recent releases landed on October 7, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Lu Reader | Chaeksum |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 days | **Every 3 days** |
| Monetization | Ad-supported | — |
| Size | 95 MB | 38 MB |
| Requires iOS | **15.5** | 17.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [sanghun jeong](https://appshunter.io/developer/6790818156) | [JAEBAEK LEE](https://appshunter.io/developer/6818554389) |

## What reviewers say

### Lu Reader

[App page](https://appshunter.io/ios/app/lu-reader-epub-and-ebook-reader/id6790819342)

This application offers a streamlined reading experience for various document and e-book formats, including EPUB and PDF. It features customizable reading settings, text-to-speech functionality, and smart library management. Users can back up their data to Google Drive.

**Highlights:** Supports EPUB, PDF, TXT, DOC, FB2, HWP, ZIP, CBZ, 11 customizable color themes, Adjustable font size, line spacing, and margins, In-app brightness control, Text-to-speech with adjustable speed, Automatic table of contents generation, Smart library with sorting and search

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

**In-app purchases:** none


### Chaeksum

[App page](https://appshunter.io/ios/app/chaeksum-calm-paper-reader/id6818563802)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip · A Coffee | $0.49 | one-time |
| Chaeksum Pro | $1.99 | one-time |
| Tip · Tea and Dessert | $1.99 | one-time |
| Tip · A Book | $6.99 | one-time |


## Frequently asked questions

### Is Lu Reader free?

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

### Is Chaeksum free?

Chaeksum is free to download, with in-app purchases available.

### Do Lu Reader or Chaeksum have ads?

Lu Reader shows ads; Chaeksum does not.

### Which is updated more often, Lu Reader or Chaeksum?

Lu Reader ships an update every 4 days, and Chaeksum every 3 days. Most recently, Lu Reader was updated on October 7, 2026 and Chaeksum on October 17, 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.*