# Natural Syntax vs Penguin

The clearest difference is rating: Penguin at 4.5 against Natural Syntax's 4.0. Penguin also leads on review sentiment (100% vs 67%) and update cadence (every 3 days vs every 12 months). Natural Syntax's advantage is iOS requirement (12.0 vs 18.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Natural Syntax sells 1 one-off in-app purchase and Penguin sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Penguin holds the better App Store score, 4.5 against 4.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 67% of Natural Syntax's written reviews are positive against 100% of Penguin's.

Natural Syntax ships an update every 12 months, Penguin every 3 days. The most recent releases landed on October 12, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Natural Syntax | Penguin |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (2 ratings)](https://appshunter.io/ios/app/natural-syntax/id1380938002/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/penguin-cbz-cbr-comic-reader/id6780071705/reviews)** |
| Number of ratings | 2 | 2 |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 3 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 11 MB | 121 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 12+ | 4+ |
| Developer | [Jeremy Buchman](https://appshunter.io/developer/285758094) | [HAEDUN KIM](https://appshunter.io/developer/1896506869) |

## What reviewers say

### Natural Syntax

[App page](https://appshunter.io/ios/app/natural-syntax/id1380938002)

This app enhances reading comprehension by subtly styling text to highlight parts of speech, similar to syntax highlighting in programming. It offers a native ePub reader with full text search and a discovery service for public domain books. Users can customize styling and themes for an improved reading experience.

**Highlights:** Syntax highlighting for parts of speech, Native paginated ePub display, Full text search, Public domain book discovery, Customizable colors and styles, Multiple themes (Dark, Light, White)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Color Customization | $0.99 | one-time |


### Penguin

[App page](https://appshunter.io/ios/app/penguin-cbz-cbr-comic-reader/id6780071705)

This app allows you to read your own comic collection in various formats, with on-device translation for Japanese manga. It offers a customizable reading experience and a smart bookshelf, all while prioritizing user privacy and local data processing.

**Highlights:** On-device manga translation for Japanese comics, Supports various file formats (CBZ, CBR, PDF, etc.), SMB and WebDAV network drive support, OPDS catalog compatibility, Smart bookshelf with automatic categorization, Customizable reading gestures and scrolling

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Lifetime — Buy Once | $3.99 | one-time |


## Frequently asked questions

### Is Natural Syntax free?

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

### Is Penguin free?

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

### Which has better reviews, Natural Syntax or Penguin?

Penguin is rated higher. Natural Syntax averages 4.0 out of 5 from 2 ratings, while Penguin averages 4.5 from 2 ratings.

### Do Natural Syntax or Penguin have ads?

Neither Natural Syntax nor Penguin shows ads.

### Which is updated more often, Natural Syntax or Penguin?

Natural Syntax ships an update every 12 months, and Penguin every 3 days. Most recently, Natural Syntax was updated on October 12, 2026 and Penguin 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.*