# Natural Syntax — Lexical ePub Reader

> ePub reader that highlights parts of speech to improve reading comprehension. (iPhone/iPad app by Jeremy Buchman.)

- Source: https://appshunter.io/ios/app/natural-syntax/id1380938002 (this page in markdown: same URL + `.md`)
- Developer: [Jeremy Buchman](https://appshunter.io/developer/285758094)
- Category: Books, Education
- Price: Free with in-app purchases
- Rating: 4.00/5 from 2 App Store ratings · 3 written reviews indexed
- Age rating: 12+
- Requires: iOS 12.0 · 11 MB
- Languages: American English
- Released: 2018-07-26
- Data updated: 2026-06-01
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/natural-syntax/id1380938002/reviews.md

## What is Natural Syntax?

As programmers read source code we passively absorb some of the meaning via syntax highlighting for the  language. NaturalSyntax aims to do the same thing with natural human language, this will improve reading comprehension and understanding by passively absorbing the parts of speech via subtle styling of the text.

Features: 
• Fully native paginated display of syntax highlighted parts of speech for ePub files
• Full text book search
• ePub parsed on demand for improved experience
• Includes discovery service to download thousands of public domain books
• Allows customization of colors and styles for each part of speech
• Includes Dark, Light and White themes with different default colors
• Allows you to turn on or off highlighting of each part of speech
• Synchronizes preferences between all your devices
• Uses system interface for interacting with your files
• Does not collect or store any personal information

Limitations:
• Can only process English ePub files
• Can only search for public domain books when signed into iCloud

## Key features

- 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)

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

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


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/natural-syntax/id1380938002/reviews.md

### 3/5 — Great except zooming

*2021-02-25*

I love the concept and the experience using it, but the pages don’t reflow properly when the text is enlarged. You loose lines at the top and bottom of the page. With the default font size, its difficult to read comfortably. Nevertheless, the app is otherwise great, and will become my primary reading app once the issue is fixed.

### 5/5 — Made me want to read again!

*2020-01-22*

I have had some issues with skipping lines or reading the same line again and the colour coding has solved that annoying issue immediately. 

Thanks for making this app, I love the idea and particularly enjoy it with a dark background. Hope my review helps spread this idea!

### 5/5 — Update fixed issue with epub loading

*2019-06-22*

Now we're cooking! Works great!

## Frequently asked questions about Natural Syntax

### What is Natural Syntax?

Natural Syntax is an ePub reader that uses syntax highlighting to visually represent parts of speech within the text. This aims to improve reading comprehension by passively absorbing linguistic structures.

### Does Natural Syntax have ads?

No, Natural Syntax does not contain advertisements. It is a free application with optional in-app purchases.

### What devices does Natural Syntax support?

Natural Syntax is available for iPhone, iPad, and iPod devices, offering a native paginated display experience across Apple's mobile ecosystem.

### Can I customize the highlighting in Natural Syntax?

Yes, you can customize the colors and styles for each part of speech, and also turn highlighting on or off for specific parts of speech to tailor the reading experience.

### What kind of books can I read with Natural Syntax?

Natural Syntax can process English ePub files. It also includes a discovery service to download thousands of public domain books, though searching for these requires iCloud sign-in.

### How often is Natural Syntax updated?

The latest version of Natural Syntax is 2.0, which was released on June 18, 2019. The app was initially released on July 26, 2018.

### What is the age rating for Natural Syntax?

Natural Syntax has an age rating of 12+, making it suitable for users aged 12 and older. It does not collect or store any personal information.

### How does Natural Syntax handle user preferences?

Natural Syntax synchronizes your preferences, including customization of colors and styles, across all your devices. This ensures a consistent reading experience wherever you use the app.

## Version history (last 2 releases)

### 2.0 — 2019-06-18

Redesigned syntax parser lets you start reading without waiting for the book to be fully parsed. Added full book search. Fully native paged text display with optional multi column view added. Works directly with ePub files and no longer creates copies of them for processing. Redesigned custom color selection. And of course, various bug fixes and improvements.

### 1.2 — 2018-07-03

No release notes.

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## More apps by Jeremy Buchman

- [MarbleJumper](https://appshunter.io/ios/app/marblejumper/id1415556293)

All apps by Jeremy Buchman: https://appshunter.io/developer/285758094

## Related topics

[syntax](https://appshunter.io/ios/topics/syntax)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*