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FreeCAD is the open-source alternative to Fusion/OnShape. Free forever; runs offline; community-maintained. The learning curve is steeper (UI is less polished), but for those who value open source, FreeCAD is the answer.
FreeCAD landscape.
WHAT FREECAD IS:
Free, open-source parametric CAD.
Cross-platform (Windows, macOS, Linux).
Runs entirely offline. Local files. No subscription.
WORKBENCHES:
FreeCAD organizes features into 'workbenches':
Part Design: parametric sketch-and-feature workflow (most used)
Part: simpler primitive-and-boolean approach
Sketcher: pure sketching for use in Part Design
Draft: 2D drafting
Arch: architecture/BIM
Path: CNC G-code generation
Robot: robot kinematics simulation
Switch workbenches for different tasks. Each has its own toolbar.
CORE WORKFLOW (Part Design):
Similar to Fusion:
1. Create a sketch on a plane
2. Add geometry + constraints
3. Add dimensions
4. Exit sketch
5. Apply a 'pad' (extrude) or 'revolution' (revolve) feature
6. Repeat
KEY FEATURES:
Pad: extrude a sketch
Pocket: subtract via extruded sketch
Revolution: spin a sketch around an axis
Loft: blend between sketches
Sweep: extrude along a path
Boolean: union, intersect, subtract
CONSTRAINTS:
Geometric: parallel, perpendicular, tangent, equal
Dimensional: distance, angle, radius
SPREADSHEET LINK:
FreeCAD has a spreadsheet where you store parameters.
Reference them in dimensions: '=Spreadsheet.phone_width'
Change spreadsheet value; model regenerates.
PRO:
- Free forever; no vendor dependency
- Open source; can read the code
- Offline (full functionality without internet)
- No data lock-in (files are openable forever)
- Active community
CON:
- UI is less polished than commercial CAD
- Documentation is uneven (some tutorials are old)
- Slightly slower for very large assemblies
- Learning curve is steeper
- Some advanced features missing or less mature
NICHE STRENGTHS:
- Open-source designs for community sharing
- Designs you want to control 100% (no cloud, no licensing dependencies)
- Long-term projects where vendor changes are a concern
LATEST VERSION (May 2026):
FreeCAD 1.0 released in late 2024.
Significantly improved UI and workflow over earlier versions.
Many recent tutorials show the modern workflow.
USE CASES:
- Educational settings where licensing is sensitive
- Open-source hardware projects (like RepRap printers)
- Hobbyists who value the open ethos
- Schools and libraries (no licensing complications)
WHEN NOT TO USE FREECAD:
- You want the smoothest learning curve (use Tinkercad first)
- You need CAM (Fusion is more mature)
- You need real-time collaboration (OnShape)
- You need professional support (paid Fusion or SolidWorks)