Fast STL Viewer

High performance binary and ASCII STL files 3d viewer for Android

App info

Version :

2.34

Category :

Productivity

Update :

November 24, 2025

Installs :

1,267,900

Developer :

Fast STL Viewer

Requires Android :

Android 4.4+

Content Rating :

Everyone

Get it on :

Download APK

App description

Android App Analysis and Review: Fast STL Viewer, Developed by Fast STL Viewer. Listed in Productivity Category. Current Version Is 2.34, Updated On 24/11/2025 . According to users reviews on Google Play: Fast STL Viewer. Achieved Over 1 million Installs. Fast STL Viewer Currently Has 4 thousand Reviews, Average Rating 3.9 Stars

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Problem:
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Please note that Samsung's "My Files" file browser has a known bug and does not open STL files directly in the app because it fails to associate the STL extension with the right app.

Solution:
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Install any other third party file manager from the Google Play Store to be able to open STL files directly while browsing.
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Binary and ASCII STL files / models 3d viewer for Android.

Key features:

1. Multiple files / models view support
2. Convenient view modes: shaded, wireframe, shaded + wireframe, points
3. Front and back faces are highlighted with different colors
4. Fast STL files / models loading
5. Big STL files / models support (millions of triangles)
6. Binary and ASCII STL files / models formats
7. Mesh boundaries / edges detection
8. Separate (unconnected) meshes / parts detection
9. Selection functionality (hold a finger on a model to select it)
9.1 To deselect a model hold a finger on the background
10. Display bounding box information in the status per selection
11. Invert normals in a selected STL-model
12. Delete a selected STL-model from the scene
13. Open STL-files directly from Gmail attachments, Google Drive, Dropbox, OneDrive via Fast STL Viewer
14. 3D Print with Treatstock option
15. The app internal file manager keeps track of 10 recently opened files for easy access

In-app purchases:

1. Configure the scene colors: model (face/wireframe/vertex) and background
2. Find the volume (cm3) of a selected STL part
3. Disable/remove the Banner Ads

We are currently offering version 2.34. This is our latest, most optimized version. It is suitable for many different devices. Free download directly apk from the Google Play Store or other versions we're hosting. Moreover, you can download without registration and no login required.

We have more than 2000+ available devices for Samsung, Xiaomi, Huawei, Oppo, Vivo, Motorola, LG, Google, OnePlus, Sony, Tablet ... with so many options, it’s easy for you to choose games or software that fit your device.

It can come in handy if there are any country restrictions or any restrictions from the side of your device on the Google App Store.

What's New

Added support for viewing models using orthographic projection.

Rate and review on Google Play store

3.9

4,049 total

5 55.2

4 17.0

3 5.9

2 2.0

1 20.0

Total number of ratings

Total number of active users rated for: Fast STL Viewer

Total number of installs (*estimated)

Estimation of total number of installs on Google Play, Approximated from number of ratings and install bounds achieved on Google Play.

Recent Comments

Steven

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

David Buckwalter

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.

Bernard Bélanger

It works, but you cannot link it to stl files on a Samsung device. You cannot open a file from the Samsung file manager, like you can do with other file types like docx or pdf. The developper seem to ignore this issue that has been reported for years now, and only indicate that it is a Samsung problem and that you should install 3rd party file manager, which is unacceptable. It has to work on a stock Samsung device without installing other, intrusive apps! Tried it again and same problem.

David Mc (WhiteFalcon)

I recently started using this app and noticed that large amounts of storage that should be there wasn't, I took a look at the storage for all of my apps, and this one seems to hold on to every file I open even after closed, I had over 38GB not cleared. I have to regularly clear the data (clearing cache doesn't work) which resets the app to it's original state to clear everything. It'd be solid if I didn't have to burp the app after feeding it. A four star if this was corrected.

A Google user

Very practical, easy to use, I've tried many apps, but this one works great for me... Quick question to dev team, is it possible to move the object?, Ie. We add one file to the apps, then load antoher One, how do we move the object so it's not overlapping. Thanks i really hope i could get an an answer.. Once again, best apps so far

Kevin Gillotti

Works as desired BUT has a real bug. If you delete a file you were looking at while the app is closed, when you come back to the app you will not longer be able to navigate to any files. The ... icon will NOT take you back to the root directory. The ONLY way to fix is to reset & clear the apps data. **UPDATE: update 1.92 seems to resolve the issue.**

Ry H

It opens. Looks like you can open files but when you hit the open option it gives you these preset directories to retrieve files from. None of which will have files and you can't file browse to the correct locations to open the files you have so it's essentially useless. That sucks.. I thought I finally found one that worked.

A Google user

Updated: confirmed bug is with Samsung My Files app. (opening with Android's built in file picker works fine. + 1 star back. :) only thing left is normals. (thank you for the reply by the way) Previous: Can't select a file from a file manager and open with this app. Must start with this app and browse to the file using it's "open file" option. would be great if it 1. registered as an app for the file extension supported and 2. showed vectors so you can tell where overhangs are for example.