# WebSocket Client vs STL Simple Viewer

The clearest difference is review sentiment: WebSocket Client at 100% against STL Simple Viewer's 18%. WebSocket Client also leads on in-app purchases (none vs 4) and ads (none vs shown). STL Simple Viewer's advantage is ratings volume (923 vs 3) and update cadence (every 5 months vs every 30 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. STL Simple Viewer sells 4 in-app purchases, starting at $0.99 per 7 days. WebSocket Client asks for nothing beyond the download.

STL Simple Viewer holds the better App Store score, 4.3 against 4.0. That said, the two scores are not equally well evidenced: STL Simple Viewer has 923 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 100% of WebSocket Client's written reviews are positive against 18% of STL Simple Viewer's, so the app with the better star average is not the one people write more warmly about.

WebSocket Client ships an update every 30 months, STL Simple Viewer every 5 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | WebSocket Client | STL Simple Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (3 ratings)](https://appshunter.io/ios/app/websocket-client/id992888282/reviews) | **[4.3 (923 ratings)](https://appshunter.io/ios/app/stl-simple-viewer/id1493598400/reviews)** |
| Number of ratings | 3 | **923** |
| Positive reviews | **100.0% of reviews** | 18.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 30 months | **Every 5 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 0 MB | 19 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Luca Ceci](https://appshunter.io/developer/923764949) | [Victor Bovio](https://appshunter.io/developer/327627515) |

## What reviewers say

### WebSocket Client

[App page](https://appshunter.io/ios/app/websocket-client/id992888282)

This tool allows developers to test WebSocket servers and websites. Users can input URLs, including HTTP, WS, and WSS secure connections, along with specific ports, to verify functionality. It's designed as a testing utility for web development.

**Highlights:** Test WebSocket servers, Supports HTTP, WS, and WSS URLs, Input specific ports, HTML5 protocol testing, Developer tool

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

**In-app purchases:** none


### STL Simple Viewer

[App page](https://appshunter.io/ios/app/stl-simple-viewer/id1493598400)

Easily view and interact with 3D STL CAD models. Supports various file types and offers advanced rendering options for detailed analysis. Get model information and explore interiors with clipping planes.

**Highlights:** View ASCII and Binary STL files, Load STL from ZIP, Rotate, pan, and zoom, Orthogonal and Perspective modes, Model info (triangle count, bounding box), Rendering options (faces, edges, transparency), Clipping plane for interiors

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro version (1 week plan) | $0.99 | per 7 days |
| Pro version (1 month plan) | $1.99 | per month |
| Remove Ads | $2.99 | one-time |
| Export Pack | $3.99 | one-time |

**What reviewers like**

- 🚀 Simple and intuitive viewer
- 👍 Useful viewing options
- 💡 Supports multiple file formats

**What reviewers complain about**

- 🐛 Frequent crashes
- 🔋 High battery consumption
- 🚨 Excessive and intrusive ads
- 🔍 Limited functionality for larger files

**Reported bugs**

- App crashes when opening larger STL files
- Inability to open some file formats
- Ads continue to appear even after paying for ad removal

**Requested features**

- Add ability to save color/lighting settings
- Improve stability and reduce crashes
- Provide an ad-free paid version


## Frequently asked questions

### Is WebSocket Client free?

WebSocket Client is free to download, with no in-app purchases.

### Is STL Simple Viewer free?

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

### Which has better reviews, WebSocket Client or STL Simple Viewer?

STL Simple Viewer is rated higher. WebSocket Client averages 4.0 out of 5 from 3 ratings, while STL Simple Viewer averages 4.3 from 923 ratings.

### Do WebSocket Client or STL Simple Viewer have ads?

STL Simple Viewer shows ads; WebSocket Client does not.

### Which is updated more often, WebSocket Client or STL Simple Viewer?

WebSocket Client ships an update every 30 months, and STL Simple Viewer every 5 months. Most recently, WebSocket Client was updated on November 1, 2026 and STL Simple Viewer on November 3, 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.*