# HTML Dual Viewer vs JavaScript Studio

The clearest difference is review sentiment: JavaScript Studio at 100% against HTML Dual Viewer's 0%. JavaScript Studio also leads on rating (4.9 vs 2.7). HTML Dual Viewer's advantage is update cadence (every 3 weeks vs every 10 months) and iOS requirement (8.4 vs 10.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

JavaScript Studio holds the better App Store score, 4.9 against 2.7. Both are backed by a comparable volume of ratings — 3 and 8 respectively. Written reviews point the same way: 0% of HTML Dual Viewer's written reviews are positive against 100% of JavaScript Studio's.

HTML Dual Viewer ships an update every 3 weeks, JavaScript Studio every 10 months. The most recent releases landed on August 15, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | HTML Dual Viewer | JavaScript Studio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (3 ratings)](https://appshunter.io/ios/app/html-dual-viewer/id1027385656/reviews) | **[4.9 (8 ratings)](https://appshunter.io/ios/app/javascript-studio/id1358563001/reviews)** |
| Number of ratings | 3 | **8** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 10 months |
| Monetization | Free | Free |
| Size | 16 MB | 33 MB |
| Requires iOS | **8.4** | 10.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Makoto Nishimoto](https://appshunter.io/developer/896702438) | [Arrowat LLC](https://appshunter.io/developer/1358562640) |

## What reviewers say

### HTML Dual Viewer

[App page](https://appshunter.io/ios/app/html-dual-viewer/id1027385656)

View HTML source code and browse web pages side-by-side. Features a syntax highlighter and Google search integration for easy code checking and site analysis. Allows real-time updates of HTML source as you navigate.

**Highlights:** Dual screen HTML viewer, Syntax highlighter, Google search integration, Real-time HTML source updates, Adjustable screen width, Full screen mode

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

**In-app purchases:** none


### JavaScript Studio

[App page](https://appshunter.io/ios/app/javascript-studio/id1358563001)

Build web applications directly on your smartphone using JavaScript, CSS, and HTML. This tool offers error checking as you code, ensuring you don't lose your ideas. It's designed for developers who need to write code on the go.

**Highlights:** Create web apps with JavaScript, CSS, HTML, Error checking during coding, Code on your smartphone, Save code and ideas, Supports HTML5

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HTML Dual Viewer free?

HTML Dual Viewer is free to download, with no in-app purchases.

### Is JavaScript Studio free?

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

### Which has better reviews, HTML Dual Viewer or JavaScript Studio?

JavaScript Studio is rated higher. HTML Dual Viewer averages 2.7 out of 5 from 3 ratings, while JavaScript Studio averages 4.9 from 8 ratings.

### Do HTML Dual Viewer or JavaScript Studio have ads?

Neither HTML Dual Viewer nor JavaScript Studio shows ads.

### Which is updated more often, HTML Dual Viewer or JavaScript Studio?

HTML Dual Viewer ships an update every 3 weeks, and JavaScript Studio every 10 months. Most recently, HTML Dual Viewer was updated on August 15, 2026 and JavaScript Studio on June 1, 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.*