# The Logic Calculator vs HTML Viewer Pro

The clearest difference is review sentiment: The Logic Calculator at 100% against HTML Viewer Pro's 49%. The Logic Calculator also leads on rating (4.4 vs 3.9) and in-app purchases (none vs 2). HTML Viewer Pro's advantage is ratings volume (45 vs 7). 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. The Logic Calculator asks for nothing beyond the download.

The Logic Calculator holds the better App Store score, 4.4 against 3.9. That said, the two scores are not equally well evidenced: HTML Viewer Pro has 45 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 100% of The Logic Calculator's written reviews are positive against 49% of HTML Viewer Pro's.

The Logic Calculator ships an update every 5 weeks, HTML Viewer Pro every 15 months. The most recent releases landed on September 26, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | The Logic Calculator | HTML Viewer Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (7 ratings)](https://appshunter.io/ios/app/the-logic-calculator/id1484264087/reviews)** | [3.9 (45 ratings)](https://appshunter.io/ios/app/html-viewer-pro/id1521187909/reviews) |
| Number of ratings | 7 | **45** |
| Positive reviews | **100.0% of reviews** | 49.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 weeks** | Every 15 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 30 MB | 33 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Ioannis Votsis](https://appshunter.io/developer/1484264086) | [Hayato Shimizu](https://appshunter.io/developer/1207195348) |

## What reviewers say

### The Logic Calculator

[App page](https://appshunter.io/ios/app/the-logic-calculator/id1484264087)

This free utility app helps users perform propositional logic operations with ease. It provides detailed feedback on input well-formedness, sentence types, set consistency, and argument validity. Users can also generate and copy truth tables to other applications.

**Highlights:** Propositional logic operations, Input well-formedness checking, Tautology, contradiction, and contingency determination, Set consistency checking, Argument validity checking, Truth table generation, Copyable truth tables

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is The Logic Calculator free?

The Logic Calculator is free to download, with no in-app purchases.

### Is HTML Viewer Pro free?

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

### Which has better reviews, The Logic Calculator or HTML Viewer Pro?

The Logic Calculator is rated higher. The Logic Calculator averages 4.4 out of 5 from 7 ratings, while HTML Viewer Pro averages 3.9 from 45 ratings.

### Do The Logic Calculator or HTML Viewer Pro have ads?

HTML Viewer Pro shows ads; The Logic Calculator does not.

### Which is updated more often, The Logic Calculator or HTML Viewer Pro?

The Logic Calculator ships an update every 5 weeks, and HTML Viewer Pro every 15 months. Most recently, The Logic Calculator was updated on September 26, 2026 and HTML Viewer Pro on October 10, 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.*