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CAD Assistant3D Model Viewer
Free

Free for personal and commercial use.

 Free

Free and open source under the MIT licence.

macOS, Android Android
  • Opens STEP, IGES and other CAD formats
  • Converts between 3D formats
  • Opens OBJ, STL and DAE files
  • Readable source code useful for learning OpenGL
  • Viewer and converter only, not a modelling tool
  • Closed source despite being built on the open OCCT kernel
  • Deliberately basic feature set
  • Viewing only, no editing
Downloadable app Downloadable app
Closed source Open source
License not stated License: MIT
Not stated if an account is needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked October 1, 2026

Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.