# naeilBook vs 이씨오 범용뷰어 3.0

The clearest difference is in-app purchases: 이씨오 범용뷰어 3.0 at none against naeilBook's 1. 이씨오 범용뷰어 3.0 also leads on update cadence (every 2 months vs every 4 months). naeilBook's advantage is review sentiment (20% vs 7%) and iOS requirement (9.0 vs 15.0). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. naeilBook sells 1 one-off in-app purchase. 이씨오 범용뷰어 3.0 asks for nothing beyond the download.

naeilBook ships an update every 4 months, 이씨오 범용뷰어 3.0 every 2 months. The most recent releases landed on October 14, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | naeilBook | 이씨오 범용뷰어 3.0 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **20.0% of reviews** | 7.1% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 257 MB | 98 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Naeil eBiz Co.](https://appshunter.io/developer/556783371) | [(주)이씨오](https://appshunter.io/developer/371073988) |

## What reviewers say

### naeilBook

[App page](https://appshunter.io/ios/app/naeilbook/id583277967)

This app offers an enhanced e-book reading experience, mimicking the comfort of physical books with features like 3D page rendering, automatic text scaling for vision, and integrated multimedia. It supports advanced annotation and search functionalities across multiple devices.

**Highlights:** 3D page rendering for a physical book feel, Automatic text scaling based on user's eyesight, Integrated multimedia playback (audio, video, animation), Multi-language text-to-speech with pronunciation guidance, Cross-device annotation sharing (notes, highlights, bookmarks), Advanced text search functionality

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Text to speech function addition | $9.99 | one-time |


### 이씨오 범용뷰어 3.0

[App page](https://appshunter.io/ios/app/30/id6738065791)

This application allows users to read eBooks from ECO, Inc. Download and access your borrowed books anytime, anywhere. Essential for re-reading loaned digital content.

**Highlights:** Read eBooks, Download books, Access borrowed books, Anytime, anywhere access

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is naeilBook free?

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

### Is 이씨오 범용뷰어 3.0 free?

이씨오 범용뷰어 3.0 is free to download, with no in-app purchases.

### Do naeilBook or 이씨오 범용뷰어 3.0 have ads?

Neither naeilBook nor 이씨오 범용뷰어 3.0 shows ads.

### Which is updated more often, naeilBook or 이씨오 범용뷰어 3.0?

naeilBook ships an update every 4 months, and 이씨오 범용뷰어 3.0 every 2 months. Most recently, naeilBook was updated on October 14, 2026 and 이씨오 범용뷰어 3.0 on October 16, 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.*