CAD Assistant is a free offline 3D CAD viewer and converter supporting formats such as STEP, IGES, STL, and more, developed by Open Cascade.
Publisher’s description
What is CAD Assistant?
CAD Assistant by Open Cascade SAS is free Windows software.
Installation and requirements
The publisher provides EXE (Inno Setup) installers for 64-bit Windows. The main installer is 33.8 MB. Installation asks for administrator rights. A silent install is possible with the installer’s documented switches.
Pros / Cons
Pros
- Free to use
- Documented silent install
Cons
- No native ARM64 build
- Installation needs administrator rights
- No update for more than a year
In short: CAD Assistant is a free Windows tool for 64-bit PCs. Updates have slowed down. Administrators can deploy it unattended.
Is CAD Assistant safe to download?
- The file is served by opencascade.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
8068FF76D0D84778E6FD7F99ECF1067B550343B880518B3B329004F001DD148B· Open the VirusTotal report for this hash - The link answered when we last checked it (October 22, 2026)
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 1 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 1.6.0Latest | October 5, 2021 | 33.8 MB | 64-bit EXE (Inno Setup) |
Install from the command line
Silent install ›winget install --id OpenCascade.CADAssistant -ecad_assistant_1.6.0_2021-10-05_win64.exe /VERYSILENT /SUPPRESSMSGBOXES /NORESTART /SP-Related guide: How to use winget: install and update apps
Also for other systems
brew install --cask cad-assistantInformation
- Publisher
- Open Cascade SAS
- Licence
- Freeware
- Price
- Free
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- EXE (Inno Setup)
- Version
- 1.6.0
- Released
- October 5, 2021
- Added to the catalogue
- March 17, 2026
- Versions listed
- 1
- Website
- opencascade.com
- winget ID
- OpenCascade.CADAssistant
Ratings and reviews
No reviews yet. Be the first to rate it.
Frequently asked questions
Is CAD Assistant free?
Yes. CAD Assistant is free to use.
Is CAD Assistant safe to download?
The download comes from opencascade.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install CAD Assistant with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Can CAD Assistant be installed silently?
Yes. The silent install page lists the exact command for each installer.
Does CAD Assistant run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.