# STL Simple Viewer vs Saturn

The clearest difference is review sentiment: Saturn at 100% against STL Simple Viewer's 18%. Saturn also leads on rating (5.0 vs 4.3) and in-app purchases (none vs 4). STL Simple Viewer's advantage is ratings volume (929 vs 3). 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. Saturn asks for nothing beyond the download.

Saturn holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: STL Simple Viewer has 929 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 18% of STL Simple Viewer's written reviews are positive against 100% of Saturn's.

STL Simple Viewer ships an update every 5 months, Saturn every 5 days. The most recent releases landed on November 11, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | STL Simple Viewer | Saturn |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (929 ratings)](https://appshunter.io/ios/app/stl-simple-viewer/id1493598400/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/saturn-drawing-pad/id1531264325/reviews)** |
| Number of ratings | **929** | 3 |
| Positive reviews | 18.1% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 5 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 19 MB | 43 MB |
| Requires iOS | 17.0 | **10.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Victor Bovio](https://appshunter.io/developer/327627515) | [Cheuk Yin Lau](https://appshunter.io/developer/1531262416) |

## 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 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


### Saturn

[App page](https://appshunter.io/ios/app/saturn-drawing-pad/id1531264325)

Easily sketch your ideas with intuitive 3D drawing tools. Capture patterns from photos and trace their outlines for unique creations. Experience a novel way to bring your imagination to life on your device.

**Highlights:** 3D ruler for scaling, rotating, and translating, Draw outlines of 3D objects, Capture patterns from photos, Trace outlines of patterns, Simple drawing interface

**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 Saturn free?

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

### Which has better reviews, STL Simple Viewer or Saturn?

Saturn is rated higher. STL Simple Viewer averages 4.3 out of 5 from 929 ratings, while Saturn averages 5.0 from 3 ratings.

### Do STL Simple Viewer or Saturn have ads?

STL Simple Viewer shows ads; Saturn does not.

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

STL Simple Viewer ships an update every 5 months, and Saturn every 5 days. Most recently, STL Simple Viewer was updated on November 11, 2026 and Saturn 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.*