Fast STL Viewer is a tools app developed by Fast STL Viewer.
Download Statistics
Fast STL Viewer has been downloaded 1.5 million times. In the last 30 days, the app was downloaded 21 thousand times.
User Ratings
Fast STL Viewer is rated 3.01 out of 5 stars. The rating is based on 4.1 thousand ratings.
App Information
Fast STL Viewer is FREE to download. The APK download size is 14.59 MB. The latest version available is 2.71. The last update was on May 10, 2026.
Technical Requirements
Fast STL Viewer requires Android 7.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play July 2015.
Description
Professional STL inspection and measurement on Android. Wall thickness analysis, printability checks, point-to-point distance, volume, surface area, cross-sections — tools that used to require a desktop workstation, now in your pocket.
Trusted by engineers, dental technicians, medical device teams, jewellery designers, and quality control inspectors worldwide. Over 1 million downloads.
PRO INSPECTION TOOLS
▸ Wall Thickness Heatmap Spot thin walls and weak points before they become print failures. Color-coded heatmap (red → yellow → green) maps thickness across your entire model. First mobile STL viewer with wall thickness analysis.
▸ Printability Dashboard Four automated mesh checks: open edges, flipped normals, non-manifold geometry, degenerate triangles. Interactive 3D overlay highlights each issue directly on your model. Catch defects before they waste material and machine time.
▸ Normal Visualization Per-face normal vectors with adjustable length, color, and thickness. Verify surface orientation at a glance — essential for diagnosing reversed faces and print artifacts.
▸ Cross-Section Slicing Adjustable X, Y, Z cutting planes to inspect internal geometry. See what's inside without splitting the file.
MEASUREMENT TOOLS - Point-to-point distance — tap two points, get the dimension - Volume and surface area with unit selector (mm, cm, in) - Bounding box dimensions (X, Y, Z) - Properties panel: triangle count, dimensions, full geometry stats
VISUALIZATION - 5 rendering modes: shaded, wireframe, combined, point cloud, normals - 6 standard views: top, bottom, left, right, front, back - Orthographic projection for accurate dimensional inspection - Custom mesh, scene, wireframe, and point cloud colors - Adjustable lighting — matte to glossy material appearance - Automatic detection of unconnected components within a single file — instantly color-coded for assembly review - Open boundary detection — identify non-watertight geometry before printing
WORKFLOW - Load multiple STL files for side-by-side comparison - Open from Gmail, Google Drive, WhatsApp, or any file manager - Share STL files directly from any app - Select and open multiple files at once via the in-app file picker - Save and export
BUILT FOR PERFORMANCE OpenGL ES 3.2 and native C++ with hardware-accelerated mesh analysis. Handles files with millions of triangles. Binary and ASCII STL.
USED BY PROFESSIONALS IN ◆ Engineering & QC — Verify wall thickness on brackets, housings, and structural components. Inspect cross-sections. Measure dimensions before manufacturing. On-device inspection for incoming parts. ◆ 3D Printing — Run printability checks before every print. Open edges, flipped normals, thin walls — catch them before they cause failures. ◆ Dental — Inspect crowns, bridges, and aligners. Measure dimensions, verify wall thickness on thin anatomical geometry. ◆ Medical Devices — Review implant and prosthetic STL files. Cross-section through anatomy, verify specs. ◆ Jewellery — Wall thickness on filigree and prong settings. Mesh integrity before casting.
Try any Pro feature free — watch a short video to unlock for 1 hour. Upgrade to Pro to keep them all.
Recent changes: Improved lighting, Wireframe and Points modes, plus bug fixes for opening STL files from external apps and file managers.
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Works well. Don't use it much but its simple and the ads are quietly at the top if you're looking for a free viewer.
★★★★★Victor Ballard· Dec 19, 2025
It's exactly what it says, a stl viewer
★★★★☆Mark C· Dec 17, 2025
Great App!!! Please consider adding a 'Lifetime' payment option to remove all restrictions etc. No idea how others like to play, but unfortunately, I will not pay for any App on a subscription basis. Thank you! 👍🏼👍🏼👍🏼
★★★★☆kent r· Aug 10, 2025
I'm only 4 stars. Free app. Because I'm unhappy .why did they delete the item dimensions that used to show at lower right when item selected. Was helpful information! Please bring it back!
★☆☆☆☆Art Steburg· Apr 1, 2026
Used to love this app, used it for a couple of years. Then they changed how ads are placed, now full screen ads that are difficult to impossible to close. I'm going to try other 3D viewers.
★☆☆☆☆Chanda117· Apr 2, 2026
I liked using this app to view stls, but now I'm getting long ads every time I open a file to view it. Very annoying and had to uninstall.
★☆☆☆☆Deepak kumar· Apr 18, 2026
It shows basic stl file and every time it is opened it plays a video with audio ad and quote literally even if I view one file after another for each file it shows ads. Ridiculous to use for free viewer. EDIT : For response from developers, then there is a bug in the code it's really popping for me every time I open the file. It's a nightmare. Also, we open files from files app sometimes and the app probably considers them as closing and reopening. You will lose every download with your response.
Google Play Rankings for Fast STL Viewer
This app is not ranked
Technologies used by Fast STL Viewer
Fast STL Viewer is requesting 13 permissions and is using 48 libraries.
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