# HTML Viewer Pro vs Mercury Interpret

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

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

HTML Viewer Pro ships an update every 15 months, Mercury Interpret fortnightly. The most recent releases landed on October 10, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | HTML Viewer Pro | Mercury Interpret |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (45 ratings)](https://appshunter.io/ios/app/html-viewer-pro/id1521187909/reviews)** | — |
| Number of ratings | **45** | — |
| Positive reviews | 49.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 15 months | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 33 MB | 24 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Hayato Shimizu](https://appshunter.io/developer/1207195348) | [Wen-Chi Chou](https://appshunter.io/developer/1642680017) |

## 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 |


### Mercury Interpret

[App page](https://appshunter.io/ios/app/mercury-interpret/id6748343086)

**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 Mercury Interpret free?

Mercury Interpret is free to download, with no in-app purchases.

### Do HTML Viewer Pro or Mercury Interpret have ads?

HTML Viewer Pro shows ads; Mercury Interpret does not.

### Which is updated more often, HTML Viewer Pro or Mercury Interpret?

HTML Viewer Pro ships an update every 15 months, and Mercury Interpret fortnightly. Most recently, HTML Viewer Pro was updated on October 10, 2026 and Mercury Interpret on October 6, 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.*