OpenSCAD vs Onshape

OpenSCAD and Onshape serve different user needs and workflows in the CAD landscape, though both enable parametric 3D modeling.

Core differences

OpenSCAD takes a code-first approach where geometry is defined through a declarative scripting language. This appeals to programmers, enables version control through text files, and excels at algorithmic designs with precise measurements. It is completely free and open-source under GPL-2.0.

Onshape provides a cloud-native graphical environment with professional-grade parametric modeling, built-in PDM, and real-time collaboration. It runs entirely in browsers with no installation required but operates on a subscription model starting at $1,500/year for commercial use.

When to choose OpenSCAD

• You prefer defining geometry through code rather than clicking and dragging
• Your designs are highly parameterized with mathematical relationships
• You need version control through Git for your CAD files
• You want completely free software with no licensing restrictions
• You are creating designs for 3D printing where precise measurements matter
• You work primarily alone or with file-based collaboration

When to choose Onshape

• You need real-time collaboration with multiple users editing simultaneously
• You want professional-grade parametric modeling with sketch constraints
• Your team requires built-in PDM with branching and release management
• You need to share designs via URL with granular permissions
• You want automatic updates and no IT maintenance
• Your organization can afford subscription pricing

Can they coexist?

Yes. Some workflows use OpenSCAD for algorithmic components (gears, enclosures, repetitive structures) and export STL files to Onshape for assembly with other parts. However, this workflow loses parametric editability in the transfer.