Fast STL Viewer

Contains adsIn-app purchases
3.8
4.07K reviews
10L+
Downloads
Content rating
Everyone
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About this app

High-performance 3D viewer for binary and ASCII STL files on Android

Key features:

1. Support for viewing multiple STL files and models simultaneously
2. Convenient view modes: shaded, wireframe, shaded + wireframe, points
3. Front and back faces highlighted with different colors
4. Fast STL file and model loading
5. Support for large STL files and models (millions of triangles)
6. Support for both binary and ASCII STL formats
7. Mesh boundary and edge detection
8. Detection of separate (unconnected) meshes and parts
9. Model selection by long-pressing on a model
10. Deselect a model by long-pressing on the background
11. Display bounding box information for the selected model in the status bar
12. Invert normals of the selected STL model
13. Remove the selected STL model from the scene
14. Open STL files directly from email attachments and cloud services (Google Drive, Dropbox, OneDrive)
15. 3D printing integration with Treatstock

In-app purchases:

1. Scene color configuration: model (faces, wireframe, vertices) and background
2. Volume calculation (cm³) for a selected STL part
3. Surface area calculation for a selected STL part
4. Slice view mode to inspect the interior of STL models from different directions
5. Disable or remove all ads, including banner and interstitial ads
Updated on
17 Dec 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection

Ratings and reviews

3.8
3.85K reviews
David Buckwalter
29 July 2022
Viewer is great, but doesn't associate file types in the phone's OS. Any time I click on a file to open, it sends me back to the google play store. Instead, I have to open the app and navigate to the file location. This is particularly annoying as a rural user because I'm often out of coverage and the play store won't load. Makes comparing multiple files a significant PITA.
22 people found this review helpful
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Fast STL Viewer
26 November 2022
Hi David, thank you for the feedback! Could you please test "My Files" again? A Samsung device with Android 13 associates STL files as expected when opening them from "My Files". Thank you!
Steven
3 March 2025
Overall it served it's purpose, initially. M Then I became more savvy in the art and needed something more than a tool that views and an editor that went more in depth if having to pay. Thank you but unfortunately it's time to move up to another app. Without this app I would have never peaked my interest in this field. A field I now can comfortably say will be my future in all aspects of the term
10 people found this review helpful
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John Shires
14 December 2025
Just works really well. A very good stl viewer.
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What's new

New paid feature: STL slice view