# STL Simple Viewer vs Sorotec App

The clearest difference is review sentiment: Sorotec App at 100% against STL Simple Viewer's 17%. Sorotec App also leads on in-app purchases (none vs 4) and ads (none vs shown). On price and device support 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. Sorotec App asks for nothing beyond the download.

STL Simple Viewer ships an update every 20 months, Sorotec App every 3 weeks. The most recent releases landed on September 26, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | STL Simple Viewer | Sorotec App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (866 ratings)](https://appshunter.io/ios/app/stl-simple-viewer/id1493598400/reviews)** | — |
| Number of ratings | **866** | — |
| Positive reviews | 17.2% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 20 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 19 MB | 5 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | +4 | 4+ |
| Developer | [Victor Bovio](https://appshunter.io/developer/327627515) | [Sorotec GmbH](https://appshunter.io/developer/1668188282) |

## What reviewers say

### 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 to OBJ, DAE, DXF, PLY | $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


### Sorotec App

[App page](https://appshunter.io/ios/app/sorotec-app/id1668188280)

This app provides CNC milling machine users with tools for selecting and correctly setting milling cutters. It aims to prevent setting errors and answer common questions simply, streamlining the user's workflow.

**Highlights:** Milling cutter selection tools, Correct setting guidance, Error prevention for settings, Answers common CNC questions, Streamlines work processes

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

**In-app purchases:** none


## Frequently asked questions

### Is STL Simple Viewer free?

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

### Is Sorotec App free?

Sorotec App is free to download, with no in-app purchases.

### Do STL Simple Viewer or Sorotec App have ads?

STL Simple Viewer shows ads; Sorotec App does not.

### Which is updated more often, STL Simple Viewer or Sorotec App?

STL Simple Viewer ships an update every 20 months, and Sorotec App every 3 weeks. Most recently, STL Simple Viewer was updated on September 26, 2026 and Sorotec App on September 15, 2026.

---

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