Model Scaler vs STL Simple Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Model Scaler
This tool instantly converts measurements between U.S. Customary and Metric units for any modeling scale. It's designed to be fast, easy, and efficient for all types of scale modelers.
- Instant scale conversion
- U.S. Customary to Metric
- Metric to U.S. Customary
- Supports any modeling scale
- Fast and efficient
Read full descriptionHide full description
Instant scale conversion tool for any modeling scale. Fast, easy and efficient scale model conversion. Quickly convert U.S. Customary and Metric measurements into any scale. Perfect for all scale modelers, railroad modelers and tabletop gamers.
STL Simple Viewer
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.
- 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
Read full descriptionHide full description
STL Simple Viewer is a great app to quickly view 3D STL & 3MF files and export them to the most commonly used CAD formats. Features: - Supports STL files both ASCII and Binary formats. - Supports 3MF files. - Load STL and 3MF files directly from ZIP archives. - Export to DXF, OBJ, DAE, PLY and USD. - Rotate, pan, and zoom models with intuitive touch controls. - Measure distances between points within your model. - Configure rendering options: faces, edges, points, background and transparency. - Render using a clipping plane (useful for viewing model interiors). - View models in Orthographic or Perspective mode. - Obtain model information including triangle count, bounding box, surface area, and volume. Privacy Policy: https://www.boviosoft.com/apps/privacy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ For support or questions: support@boviosoft.com
Screenshots
Verdict
The clearest difference is rating: STL Simple Viewer at 4.3 against Model Scaler's 2.9. STL Simple Viewer also leads on ratings volume (866 vs 12). Model Scaler's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. STL Simple Viewer sells 4 in-app purchases, starting at $0.99 per 7 days. Model Scaler asks for nothing beyond the download.
STL Simple Viewer holds the better App Store score, 4.3 against 2.9. That said, the two scores are not equally well evidenced: STL Simple Viewer has 866 ratings behind it against 12, so its average is the more settled of the two. Written reviews complicate that: 40% of Model Scaler's written reviews are positive against 17% of STL Simple Viewer's, so the app with the better star average is not the one people write more warmly about.
Model Scaler ships an update every 6 months, STL Simple Viewer every 20 months. The most recent releases landed on June 11, 2026 and September 23, 2026 respectively.
| Parameter | Model Scaler | STL Simple Viewer |
|---|---|---|
| Price | Free | Free |
| Rating | 2.9 (12 ratings) | 4.3 (866 ratings) — better |
| Positive reviews | 40.0% of reviews — better | 17.2% of reviews |
| Number of ratings | 12 | 866 — better |
| Update frequency | Every 6 months — better | Every 20 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 9.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 11 MB | 19 MB |
| Age rating | 4+ | +4 |
| Developer | Woodland Scenics | Victor Bovio |
Customer experience
Model Scaler
STL Simple Viewer
Bugs and requests
Model Scaler
Not enough reviews yet to summarise bugs or requests.
STL Simple Viewer
Reported bugs
3 issues- 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
3 requests- Add ability to save color/lighting settings
- Improve stability and reduce crashes
- Provide an ad-free paid version
In-app purchases
Model Scaler
No in-app purchases
STL Simple Viewer
- Pro version (1 week plan)$0.997 Days
- Pro version (1 month plan)3 Days trial$1.991 Month
- Remove Ads$2.99
- Export to OBJ, DAE, DXF, PLY$3.99
Questions
Is Model Scaler free?
Is STL Simple Viewer free?
Which has better reviews, Model Scaler or STL Simple Viewer?
Do Model Scaler or STL Simple Viewer have ads?
Which is updated more often, Model Scaler or STL Simple Viewer?
Other comparisons
