STL Viewer is an advance application for downloading and viewing the contents of Stereo Lithography files. STL files are representations of the surfaces of solid models that have been created in CAD programs. STL files are a neutral format that can easily be generated by almost all CAD systems. Now you can take your favorite models with you to show others.

A picture-in-picture feature provides another 3D view of the model that can be manipulated independently.

The user interface supports zooming, panning and full 3D rotation of the model. It can also export the screen image to the photo album for other uses such as emailing.

The current version support ASCII and binary format. STL files can be imported from iTunes as well as email attachments and AirDrop.
Imports from Files and iCloud have been recently added.

The following values are also provided for each model:
Axis aligned box volume and dimensions. The volume of the surface, the surface area and model weight are calculated as well.

What’s New

Version 3.3

Support for Recents and iCloud have been added for more options to save and load files.
Added support for Dark Mode.
A picture-in-picture feature provides another 3D view of the model that can be
manipulated independently.

Ratings and Reviews

2.9 out of 5
16 Ratings

16 Ratings

Zrt3678p1 ,

Too hard to access files

Almost useless without smb or cloud access. I deleted it.

JK cad user ,

Very impressive

This app supports many advanced features that I haven't seen in other mobile viewers. The 3D rotation is smooth and I love the ability to select any place on the model to set the rotation point. But the best feature is being able to enter a material density and have the weight of the model calculated along with the volume. This is a feature most desktop viewers don't have. You usually have to get this from the original CAD system.

engineering user ,


This app works great. I was able to load many STL files and not be bothered with adds. It gives great details about each model as well. Excellent interface as well.

Developer Response ,

Thank you very much for your response. Please contact us if you have any issues or would like to request a new feature.

App Privacy

The developer, Micro Systems Engineering, Inc., has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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