# HTML Viewer Pro vs Atmosic DevTools

The clearest difference is in-app purchases: Atmosic DevTools at none against HTML Viewer Pro's 2. Atmosic DevTools also leads on ads (none vs shown) and update cadence (every 2 months vs every 15 months). HTML Viewer Pro's advantage is iOS requirement (12.0 vs 14.5). On price and device support there is nothing between them.

Both are free to download. HTML Viewer Pro sells 2 in-app purchases, starting at $1.99 per month. Atmosic DevTools asks for nothing beyond the download.

HTML Viewer Pro ships an update every 15 months, Atmosic DevTools every 2 months. The most recent releases landed on September 5, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | HTML Viewer Pro | Atmosic DevTools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (45 ratings)](https://appshunter.io/ios/app/html-viewer-pro/id1521187909/reviews)** | — |
| Number of ratings | **45** | — |
| Positive reviews | 47.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 15 months | **Every 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 33 MB | 7 MB |
| Requires iOS | **12.0** | 14.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Hayato Shimizu](https://appshunter.io/developer/1207195348) | [Atmosic Technologies, Inc.](https://appshunter.io/developer/1513210735) |

## What reviewers say

### HTML Viewer Pro

[App page](https://appshunter.io/ios/app/html-viewer-pro/id1521187909)

View HTML source code from URLs or directly from Safari. This app offers multi-tab browsing, bookmarking, and search functionality. Customize the display with various themes, fonts, and user agents.

**Highlights:** View source code from URLs, View source code from Safari share, Multi-tab browsing, Bookmark and history management, Keyword search in source code, Switch between static and dynamic HTML, Customizable themes and fonts

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (Monthly plan) | $1.99 | per month |
| Premium (Buying out) | $19.99 | one-time |


### Atmosic DevTools

[App page](https://appshunter.io/ios/app/atmosic-devtools/id1592941402)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HTML Viewer Pro free?

HTML Viewer Pro is free to download, with in-app purchases available.

### Is Atmosic DevTools free?

Atmosic DevTools is free to download, with no in-app purchases.

### Do HTML Viewer Pro or Atmosic DevTools have ads?

HTML Viewer Pro shows ads; Atmosic DevTools does not.

### Which is updated more often, HTML Viewer Pro or Atmosic DevTools?

HTML Viewer Pro ships an update every 15 months, and Atmosic DevTools every 2 months. Most recently, HTML Viewer Pro was updated on September 5, 2026 and Atmosic DevTools on September 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.*