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12 best build123d alternatives (2026)

build123d is filed as open source 3D Modeling, Spatial & Digital Craft software, best for Pythonic CAD scripting. Successor-feel to CadQuery; agent-friendly. All 12 picks sit on our 3D Modeling, Spatial & Digital Craft shelf with overlapping use cases. This page lists 12 neighbors we actually store beside build123d — not vendor rankings.

At a glance

Tool
build123d
Pricing
Open Source
Platforms
Python / local
Alternatives listed
12

Full build123d record · Data is from our catalog, not vendor reviews.

Alternatives

  1. 1OpenSCAD
    Open Source · Desktop / CLI

    Code-CAD classic; makers' staple

    also in 3D & Spatial

  2. 2FreeCAD
    Open Source · Desktop

    FOSS engineering CAD

    also in 3D & Spatial

  3. 3Apolo CAD
    Open Source · Local / self-host

    Industrial agent CAD wedge on OpenCascade

    also in 3D & Spatial

  4. 4CAD/CAE Copilot
    Open Source · Local / CLI

    Spec-driven editable engineering packages

    also in 3D & Spatial

  5. 5CadQuery
    Open Source · Python / local

    Long-time code-CAD gem

    also in 3D & Spatial

  6. 6CascadeStudio
    Open Source · Web / local

    In-browser BREP playground

    also in 3D & Spatial

  7. 7Shapr3D
    Freemium · iPad + Desktop

    Industrial design sketch→CAD bridge

    also in 3D & Spatial

  8. 8BlocksCAD
    Free · Web

    Teaching parametric craft

    also in 3D & Spatial

  9. 9Onshape
    Freemium · Web

    **Near-mainstream** cloud CAD

    also in 3D & Spatial

  10. 10Autodesk Fusion
    Freemium · Desktop + cloud

    **Mainstream** maker/prosumer CAD

    also in 3D & Spatial

  11. 11agentcad
    Open Source · Web / local

    Agent-native CAD verification loop

    also in 3D & Spatial

  12. 12Microsoft TRELLIS.2
    Open Source · Local / self-host

    Best self-host OSS model path

    also in 3D & Spatial