Comparison

STL Simple Viewer vs Twyn View

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read 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

About

Twyn View

Read full description

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

STL Simple Viewer4 screens
Twyn View4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
STL Simple Viewer versus Twyn View: the parameters behind the verdict, then further details
ParameterSTL Simple ViewerTwyn View
PriceFreeFree
Rating4.3 (866 ratings) — better—
Positive reviews17.2% of reviews—
Number of ratings866 — better—
Update frequencyEvery 20 monthsEvery 3 weeks — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.016.0 — better
Further details — not scored
Size19 MB324 MB
Age rating+44+
DeveloperVictor BovioVisometry 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

4 purchases

STL Simple Viewer

Subscriptions2
  • Pro version (1 week plan)$0.997 Days
  • Pro version (1 month plan)3 Days trial$1.991 Month
One-time2
  • Remove Ads$2.99
  • Export to OBJ, DAE, DXF, PLY$3.99
None

Twyn View

No in-app purchases

Questions

Is STL Simple Viewer free?
STL Simple Viewer is free to download, with in-app purchases available.
Is Twyn View free?
Twyn View is free to download, with no in-app purchases.
Do STL Simple Viewer or Twyn View have ads?
STL Simple Viewer shows ads; Twyn View does not.
Which is updated more often, STL Simple Viewer or Twyn View?
STL Simple Viewer ships an update every 20 months, and Twyn View every 3 weeks. Most recently, STL Simple Viewer was updated on September 23, 2026 and Twyn View on September 11, 2026.

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