Fast STL Viewer

Fast STL Viewer

Contains adsIn-app purchases

About this app

Inspect, measure, and analyze STL files on your Android device. Used by engineers, dental technicians, medical professionals, educators, and quality control teams worldwide. Over 1 million downloads.

PROFESSIONAL TOOLS
Volume and surface area measurement with unit selector (mm, cm, in). Slice view with adjustable X, Y, and Z cross-section sliders to inspect internal geometry. Custom color settings for front and back faces. Remove all ads with a Pro subscription.

CORE FEATURES
- Load multiple STL files simultaneously for side-by-side comparison
- 4 rendering modes: shaded, wireframe, combined, and point cloud
- 6 standard views: top, bottom, left, right, front, back
- Automatic part detection — find and color-code separate components
- Boundary detection — identify open edges and mesh issues
- Orthographic projection for precise inspection
- Open STL files from email, Google Drive, Dropbox, or any file manager
- Save and export models

BUILT FOR PERFORMANCE
Powered by OpenGL ES 3.2 and native C++ mesh processing. Handles large STL files with millions of triangles. Supports both binary and ASCII formats.

Whether you are checking a dental crown, inspecting an engineering bracket, reviewing a medical implant, or teaching a CAD course — Fast STL Viewer gives you professional inspection tools in your pocket.

Ratings and reviews

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.

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

It's the best app of its kind out there because of the simplicity. You open a file and view it. That's it. Perfect. However, the ads have been horrendously upscaled over the last few days. Every time I open a file, I have to watch a 30-second video, sometimes 2, back to back. The ads used to be a scrolling banner at the top and that was fine and unintrusive. If it was back to that I'd give 5 stars, but now I'm looking for an alternative. Too annoying to use at present.

What’s new

New Properties dialog: view triangle count, bounding box, volume, and surface area in one place with unit conversion.