STL Simple Viewer vs Twyn View
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
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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
Twyn View
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Get Quality right, faster: Twyn is changing the way how parts, components and assemblies are controlled for quality and suitability, addressing industry’s needs to find errors fast, to avoid down times, to reduce scrap and rework and to cut follow-up costs in manufacturing and service. Along with Twyn Studio you are able to create inspection process definitions within minutes from complex CAD files and transfer them to your iPad. Inspect with your device and create automatized reports instantly.
Screenshots
Verdict
The clearest difference is in-app purchases: Twyn View at none against STL Simple Viewer's 4. Twyn View also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 20 months). On price, device support and iOS requirement 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. Twyn View asks for nothing beyond the download.
STL Simple Viewer ships an update every 20 months, Twyn View every 3 weeks. The most recent releases landed on September 23, 2026 and September 11, 2026 respectively.
| Parameter | STL Simple Viewer | Twyn View |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (866 ratings) — better | — |
| Positive reviews | 17.2% of reviews | — |
| Number of ratings | 866 — better | — |
| Update frequency | Every 20 months | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 19 MB | 324 MB |
| Age rating | +4 | 4+ |
| Developer | Victor Bovio | Visometry GmbH |
Bugs and 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
Twyn View
Not enough reviews yet to summarise bugs or requests.
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
Twyn View
No in-app purchases
Questions
Is STL Simple Viewer free?
Is Twyn View free?
Do STL Simple Viewer or Twyn View have ads?
Which is updated more often, STL Simple Viewer or Twyn View?
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