Fast STL Viewer

2.71

Fast STL Viewer

3.09

4,050 reviews

1,000,000+
Downloads

Free

Inspect & measure STL files — wall thickness, printability, cross-sections.

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Fast STL Viewer compared with similar apps

About Fast STL Viewer

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 24 thousand times.

User Ratings

Fast STL Viewer is rated 3.09 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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More data about Fast STL Viewer

Price	Free to download
Total downloads	1.5 million
Recent downloads	24 thousand
Rating	3.09 based on 4.1 thousand ratings
Ranking	Not ranked
Version	2.71
APK size	14.6 MB
Number of libraries	48
Designed for Android	7.0+
Suitable for	Everyone
Ads	Contains ads

App Performance Report

Get a detailed PDF report for Fast STL Viewer with download trends, rating history, and key performance statistics — useful for competitive research or tracking your own app. Learn more

Get PDF Report — $29

Google Play Rating history and histogram

1.7K

400

200

1.7K

Downloads over time

Fast STL Viewer has been downloaded 1.5 million times. Over the past 30 days, it averaged 790 downloads per day.

Changelog of Fast STL Viewer

May 10, 2026UpdateVersion 2.71
May 4, 2026UpdateVersion 2.70
Apr 25, 2026UpdateVersion 2.68
Apr 18, 2026UpdateVersion 2.66
Apr 13, 2026UpdateVersion 2.65
Apr 8, 2026UpdateVersion 2.64
Apr 5, 2026UpdateVersion 2.63
Mar 30, 2026UpdateVersion 2.61
Mar 28, 2026UpdateVersion 2.60
Mar 27, 2026CategoryMoved from Productivity to Tools
Mar 26, 2026UpdateVersion 2.59
Mar 22, 2026UpdateVersion 2.58
Mar 17, 2026UpdateVersion 2.54
Mar 13, 2026UpdateVersion 2.52
Mar 9, 2026UpdateVersion 2.49
Mar 4, 2026UpdateVersion 2.43
Dec 17, 2025UpdateVersion 2.41
Dec 15, 2025UpdateVersion 2.39
Dec 6, 2025UpdateVersion 2.37
Nov 30, 2025UpdateVersion 2.36
Nov 24, 2025UpdateVersion 2.34
Nov 16, 2025UpdateVersion 2.31
Nov 9, 2025UpdateVersion 2.30
Apr 6, 2025UpdateVersion 2.29
Mar 30, 2025UpdateVersion 2.28
Mar 16, 2025UpdateVersion 2.27
Mar 4, 2025UpdateVersion 2.25
Feb 25, 2025UpdateVersion 2.22
Dec 19, 2024UpdateVersion 2.19
Oct 26, 2024Installs1,000,000+ installs
Sep 1, 2024UpdateVersion 2.17
Jun 22, 2024UpdateVersion 2.16
Jun 17, 2024UpdateVersion 2.15
Jun 11, 2024UpdateVersion 2.13
Dec 17, 2022UpdateVersion 2.11
Nov 27, 2022UpdateVersion 2.10
Nov 6, 2022UpdateVersion 2.09
Jun 26, 2022UpdateVersion 2.07
Jun 5, 2022UpdateVersion 2.06
May 5, 2022UpdateVersion 1.99
Feb 6, 2022UpdateVersion 1.97
Jan 16, 2022UpdateVersion 1.96
Nov 8, 2021Installs500,000+ installs
Jul 7, 2021UpdateVersion 1.93
Apr 5, 2021UpdateVersion 1.92
Jan 22, 2021UpdateVersion 1.91
Jan 16, 2021UpdateVersion 1.90
Jun 22, 2019UpdateVersion 1.84
May 18, 2019UpdateVersion 1.83
May 1, 2019UpdateVersion 1.82

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Developer information for Fast STL Viewer

Fast STL Viewer

support@fast-stl.com

Website

N/A

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Comments on Fast STL Viewer for Android

★★★★☆ 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!

★★★★★ Victor Ballard · Dec 19, 2025

It's exactly what it says, a stl viewer

★★★★★ Adam Albanese · Mar 7, 2026

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.

★☆☆☆☆ 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.

★☆☆☆☆ 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.

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 49 libraries.

Permissions

Development tools

test access to protected storage

Network communication

view network connections, full network access, Google Play billing service

System tools

prevent phone from sleeping

Extra

android.permission.ACCESS_ADSERVICES_AD_ID, android.permission.ACCESS_ADSERVICES_ATTRIBUTION, android.permission.ACCESS_ADSERVICES_TOPICS, android.permission.FOREGROUND_SERVICE, android.permission.MANAGE_EXTERNAL_STORAGE, com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE, com.google.android.gms.permission.AD_ID, com.performance.meshview.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Ad network libraries

AdMob

Open Measurement InMobi Android Library Icon

InMobi

Social libraries

None found

Development tools

Android Jetpack core

Android Architecture Components

Android Jetpack VersionedParcelable Firebase Android Library Icon

Firebase

Android Jetpack Annotations Android Jetpack Widgets Android Library Icon

Android Jetpack Widgets Android Jetpack AppCompat Android Library Icon

Android Jetpack AppCompat AndroidX Activity Android Library Icon

AndroidX Activity Android Activity Saved State Android Library Icon

Android Activity Saved State AndroidX Loader Android Library Icon

AndroidX Loader

Android Transition Support Library

Android Support Library collections Kotlin Android Library Icon

Kotlin

Android Support VectorDrawable

AndroidX Legacy: Support Library core utils AndroidX Cursor Adapter Android Library Icon

AndroidX Cursor Adapter

AndroidX Local Broadcast Manager

Android Support Library Print

Android Support Library Document File AndroidX App Startup Android Library Icon

AndroidX App Startup Android WorkManager Android Library Icon

Android WorkManager AndroidX Widget ViewPager2 Android Library Icon

AndroidX Widget ViewPager2 Okio Android Library Icon

Okio

AndroidX Concurrent Futures JetBrains Annotations Android Library Icon

JetBrains Annotations AndroidX Emoji / Emoji2 Android Library Icon

AndroidX Emoji / Emoji2 IntelliJ IDEA Android Library Icon

IntelliJ IDEA AndroidX Tracing Android Library Icon

AndroidX Tracing AndroidX SQLite Android Library Icon

AndroidX SQLite AndroidX ExifInterface Android Library Icon

AndroidX ExifInterface AndroidX DynamicAnimation Android Library Icon

AndroidX DynamicAnimation AndroidX ProfileInstaller Android Library Icon

AndroidX ProfileInstaller Chromium Android Library Icon

Chromium

Google Guava AndroidX Inspection Android Library Icon

AndroidX Inspection Picasso Android Library Icon

Picasso

AndroidX Resource Inspection AndroidX WebKit Android Library Icon

AndroidX WebKit Jetpack DataStore Android Library Icon

Jetpack DataStore The Checker Framework Android Library Icon

The Checker Framework AndroidX Privacy Sandbox Android Library Icon

AndroidX Privacy Sandbox Kotlin Parcelize Android Library Icon

Kotlin Parcelize AndroidX Media3 (ExoPlayer) Android Library Icon

AndroidX Media3 (ExoPlayer) AndroidX Graphics Android Library Icon

AndroidX Graphics AndroidX Test Android Library Icon

AndroidX Test

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Fast STL Viewer

Inspect & measure STL files — wall thickness, printability, cross-sections.

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Fast STL Viewer compared with similar apps

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About Fast STL Viewer

Download Statistics

User Ratings

App Information

Technical Requirements

More data about Fast STL Viewer

Google Play Rating history and histogram

Downloads over time

Changelog of Fast STL Viewer

Developer information for Fast STL Viewer

Share Fast STL Viewer

Comments on Fast STL Viewer for Android

Google Play Rankings for Fast STL Viewer

Technologies used by Fast STL Viewer

Permissions

Ad network libraries

Social libraries

Development tools