FreeCAD

FreeCAD is a free, open-source professional-grade 3D solid modelling application for Mac, built around a history-based parametric engine that lets engineers and designers revise any dimension at any stage of a design without starting over.

What is FreeCAD?

FreeCAD is an open-source, cross-platform solid modeller aimed at real engineering and product design work — not artistic sculpting. At its core is a constraint-driven parametric kernel: every feature you add (extrude a sketch, cut a pocket, fillet an edge) lives in a visible model tree, and changing a value upstream cascades forward automatically. Think of it as the hobbyist and independent engineer's answer to Fusion 360 or SolidWorks — without the subscription invoice.

The application is organized into workbenches — switchable environments for Part design, Sheet Metal, FEM simulation, Path (CNC toolpath generation), TechDraw (2D drawing sheets), and more. You can switch between them inside a single session, which makes it genuinely capable of taking a part from concept sketch all the way to a printable STL or a machining toolpath in one file.

What does FreeCAD do best?

FreeCAD excels at constraint-driven solid modelling for mechanical parts and assemblies — the kind of work where every radius and wall thickness needs to be an exact number, not an artist's approximation.

• Parametric history tree: change a sketch dimension and watch fillets, pockets, and patterns update downstream. I've caught tolerance errors in a bracket design weeks after the fact by editing a single value.
• FEM workbench: basic finite-element stress analysis without leaving the app — not a replacement for ANSYS, but surprisingly capable for early-stage sanity checks.
• Path workbench: generates G-code for CNC mills and routers. For a maker with a desktop CNC machine this alone is worth the price of admission (which is zero).
• STEP / IGES import and export: FreeCAD opens and saves the neutral formats that professional CAD shops exchange. Sending a STEP file to a sheet-metal fabricator works without drama.
• Python scripting: the entire model API is scriptable, so repetitive geometry can be generated programmatically — a capability Fusion 360's free tier hides behind a paywall.

Is FreeCAD free?

FreeCAD is completely free to download and use — including for commercial projects. It is released under the LGPL licence, which means you can use it professionally, distribute parts you designed with it, and even extend it without owing anyone a royalty or subscription fee.

There is no "free tier" versus a paid tier. The full application — including FEM, Path, and the Assembly workbench — is available to every user on day one. Donations and sponsorships are welcomed and listed on the project's website, but they are entirely optional.

Who should use FreeCAD?

FreeCAD is the right tool for mechanical engineers, industrial designers, electronics enclosure designers, and serious makers who need dimensionally accurate solid models — and who either can't justify a commercial CAD subscription or prefer open-source tooling on principle.

It is probably not the best fit for architects (FreeCAD's BIM workbench exists but lags behind dedicated tools like Archicad or Vectorworks), nor for organic character modellers (Blender owns that space). Students learning parametric CAD before entering a workplace that runs SolidWorks or CATIA will find the conceptual vocabulary — sketches, constraints, features, assemblies — directly transferable.

What are the best FreeCAD alternatives?

The closest alternatives depend on your priorities. Fusion 360 is more polished, has tighter CAM integration, and carries a subscription cost that becomes significant at professional scale. Onshape runs entirely in the browser and has an excellent free tier for public documents, but your files live on someone else's server. OpenSCAD is purely code-driven — no GUI modelling at all — and is beloved by a specific kind of programmer-designer. For anyone who wants a GUI parametric modeller with zero recurring cost and full offline operation, FreeCAD is the only serious contender in the open-source space.

If budget is genuinely no object and you want the smoothest experience, Fusion 360 or SolidWorks will feel more refined. But FreeCAD's capability gap with commercial tools has closed meaningfully over the past few release cycles, particularly with the Assembly workbench and improved topological naming stability.

How does FreeCAD compare to Fusion 360?

FreeCAD wins on price (free vs. subscription), offline-first operation, LGPL licensing for commercial use, and Python scripting depth. Fusion 360 wins on UI polish, cloud collaboration, integrated generative design, and a more mature CAM environment. The infamous topological naming problem — where editing early features scrambles downstream references — has historically been FreeCAD's biggest practical pain point versus Fusion; recent releases have made serious progress here but Fusion 360 still handles it more gracefully. For a solo engineer who primarily exports STEP files to a fabricator rather than collaborating on a shared cloud model, FreeCAD's trade-offs are entirely acceptable.