# STL File Viewer Pro vs HTML Viewer

The clearest difference is ads: HTML Viewer at none against STL File Viewer Pro's shown. HTML Viewer also leads on review sentiment (25% vs 10%) and iOS requirement (13.0 vs 16.6). STL File Viewer Pro's advantage is ratings volume (65 vs 9). On price, rating, update cadence and in-app purchases there is nothing between them.

Both are free to download. STL File Viewer Pro sells 3 in-app purchases, starting at $1.99 per 7 days and HTML Viewer sells 4 in-app purchases, starting at $14.99 per year. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.5 for STL File Viewer Pro against 4.6 for HTML Viewer. That said, the two scores are not equally well evidenced: STL File Viewer Pro has 65 ratings behind it against 9, so its average is the more settled of the two. Written reviews are what separate them: 10% of STL File Viewer Pro's written reviews are positive against 25% of HTML Viewer's.

STL File Viewer Pro ships an update fortnightly, HTML Viewer every 8 days. The most recent releases landed on September 24, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | STL File Viewer Pro | HTML Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (65 ratings)](https://appshunter.io/ios/app/stl-file-viewer-pro/id6741022143/reviews) | **[4.6 (9 ratings)](https://appshunter.io/ios/app/html-viewer-view-source/id6746666386/reviews)** |
| Number of ratings | **65** | 9 |
| Positive reviews | 10.0% of reviews | **25.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 8 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#36** | #79 |
| Size | 16 MB | 84 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Andeesh Mehdi Syed](https://appshunter.io/developer/1676226599) | [Utsav Mangla](https://appshunter.io/developer/1729995457) |

## What reviewers say

### STL File Viewer Pro

[App page](https://appshunter.io/ios/app/stl-file-viewer-pro/id6741022143)

**Currently charting:** #36 Top Grossing · Developer Tools, #106 Top Free · Developer Tools (US App Store)

Easily view, rotate, and inspect 3D STL files on your iPhone or iPad. Load models instantly from various sources for 3D printing, design review, or engineering inspection.

**Highlights:** Instant STL file loading, Full 360° rotation and zoom, Sharp detail rendering, Light and dark mode support, Lightweight and fast performance, Open files from Files, email, AirDrop

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Monthly | $3.99 | per month |
| Ad Free for 1 Year | $24.99 | per year |


### HTML Viewer

[App page](https://appshunter.io/ios/app/html-viewer-view-source/id6746666386)

**Currently charting:** #79 Top Grossing · Developer Tools, #208 Top Free · Developer Tools (US App Store)

Inspect and analyze the HTML source code of any website or local files. Features include element inspection, syntax highlighting, and multi-tab support for efficient workflow. Ideal for developers and students learning web technologies.

**Highlights:** View website source code, Inspect elements, Open local/iCloud HTML files, Multiple tabs support, Syntax highlighting, Search and copy code

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HTML Viewer - All access - Mid | $14.99 | per year |
| HTML Viewer - All access - Max | $19.99 | per year |
| HTML Viewer - All access - Max | $19.99 | per year |
| HTML Viewer - Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is STL File Viewer Pro free?

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

### Is HTML Viewer free?

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

### Which has better reviews, STL File Viewer Pro or HTML Viewer?

HTML Viewer is rated higher. STL File Viewer Pro averages 4.5 out of 5 from 65 ratings, while HTML Viewer averages 4.6 from 9 ratings.

### Do STL File Viewer Pro or HTML Viewer have ads?

STL File Viewer Pro shows ads; HTML Viewer does not.

### Which is updated more often, STL File Viewer Pro or HTML Viewer?

STL File Viewer Pro ships an update fortnightly, and HTML Viewer every 8 days. Most recently, STL File Viewer Pro was updated on September 24, 2026 and HTML Viewer on September 16, 2026.

### Which is more popular, STL File Viewer Pro or HTML Viewer?

STL File Viewer Pro currently peaks at #36 in the App Store charts, and HTML Viewer at #79. Chart position reflects recent download velocity rather than total install base.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*