CAD Assistant by OPEN CASCADE is an offline viewer and converter for 3D CAD and mesh models, enabling on-device viewing, assembly navigation, and broad format support. It offers STEP, IGES, BREP, and mesh formats, with export to multiple formats and a touch-friendly workflow. With 500,000+ total and a 4.25 rating from 3166 users, it shows strong adoption in productivity for CAD tasks.
Pros & Cons
Offline operation enables on-device viewing and conversion without internet
Broad format support for CAD and mesh formats
Assembly-aware workflow with property querying
Export to multiple CAD/mesh formats and PNG export
Limited editing tools and absence of DWG/PDF editing features compared to some competitors
Performance may be slower on large files on devices with limited memory or GPUs
Requires OpenGL ES 3.0+; may not run on older devices or hardware
About CAD Assistant
CAD Assistant was a productivity app developed by OPEN CASCADE. It was removed from Google Play May 10, 2025 and is no longer available for download.
Download Statistics
CAD Assistant had been downloaded 740 thousand times before it became unavailable.
User Ratings
CAD Assistant was rated 4.25 out of 5 stars, based on 3.2 thousand ratings.
App Information
CAD Assistant was free to download. The APK download size was 43.16 MB. The last available version was 1.6.0. The last update was on October 6, 2021.
Technical Requirements
CAD Assistant required Android 4.1+ or higher. The app had a content rating of Everyone. The app had been available on Google Play December 2014.
Description
OPEN CASCADE CAD Assistant for Android is an offline viewer and converter for 3D CAD and mesh models.
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OPEN CASCADE SAS Headquarters 1 place des Frères Montgolfier, 78280 Guyancourt, France
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Comments on CAD Assistant for Android
★★★★★
The best app for viewing cad files on the go. The ability to hide and show is particularly handy. The options are sufficient and easy to use.
★★★★★
Best 3D viewer app that I've come across so far. I've tried alot and most won't even load an obj or stl and are purely built around the idea that it can but can't. I was about to give up, and I found this. Works great for what I'm using it for with included bells and whistles. Thank you!
★★★★★
Easy to view 3d model, but unable to open xt format file. Please work on it
★★☆☆☆
After the last update of app it's not shown in supported app list on WhatsApp, due to these files cannot be directly opened from WhatsApp.
★★☆☆☆
And how am I supposed to open textures when it opens some "computer"?
★★☆☆☆
Works, but doesn't integrate well with Android. Can load files only through its dialog. Selecting a file in My Files then choosing Open With doesn't work.
Technologies used by CAD Assistant
CAD Assistant is requesting 3 permissions and is using 1 libraries.
Permissions
Development tools
test access to protected storage
Storage
modify or delete the contents of your USB storage
System tools
prevent phone from sleeping
No known libraries used.
Trust & Safety: App requests storage-related permissions (READ_EXTERNAL_STORAGE, WRITE_EXTERNAL_STORAGE) and WAKE_LOCK to support opening/saving files and background processing. No network permissions are listed; designed for offline CAD viewing and conversion.
Each subscription will automatically renew 3 days before the expiration date for
the same time period. Subscriptions can be cancelled at any time before the renewal.