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.

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.

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 3.1

This version checks to see if a duplicate named model already exists when importing
a new model with the same name via email or AirDrop.

Ratings and Reviews

3.2 out of 5
12 Ratings
12 Ratings
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.

EvieT. ,

Best STL viewer I've tried!

The ability to calculate the volume and weight is amazing for an iPad, and it's the only one in the App Store that does it!

DWK38 ,

Very nice!!

Works very well. Way better than the others.


Micro Systems Engineering, Inc.
13.7 MB
Requires iOS 11.3 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© Micro Systems Engineering, Inc.


  • Family Sharing

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

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