# STL Simple Viewer vs Dotzza

The clearest difference is ads: Dotzza at none against STL Simple Viewer's shown. Dotzza also leads on update cadence (fortnightly vs every 20 months) and iOS requirement (15.6 vs 17.0). On price, in-app purchases 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 and Dotzza sells 4 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

STL Simple Viewer ships an update every 20 months, Dotzza fortnightly. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | STL Simple Viewer | Dotzza |
| --- | --- | --- |
| 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 | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 20 months | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 19 MB | 92 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | +4 | 4+ |
| Developer | [Victor Bovio](https://appshunter.io/developer/327627515) | [Dotzza](https://appshunter.io/developer/1871725828) |

## 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


### Dotzza

[App page](https://appshunter.io/ios/app/dotzza/id6758245020)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dotzza Lite Monthly | $2.99 | per month |
| Dotzza Pro – Monthly | $2.99 | per month |
| Dotzza Lite – Yearly | $19.99 | per year |
| Dotzza Pro – Yearly | $29.99 | per year |


## Frequently asked questions

### Is STL Simple Viewer free?

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

### Is Dotzza free?

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

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

STL Simple Viewer shows ads; Dotzza does not.

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

STL Simple Viewer ships an update every 20 months, and Dotzza fortnightly. Most recently, STL Simple Viewer was updated on September 30, 2026 and Dotzza on September 29, 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.*