Free CAD
Open-source parametric 3D modeler for mechanical engineering and product design.
Open the official app on www.freecad.org
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Use it free
Open the official tool or demo — no account needed.
Self-host it
Run the open-source version on your own infrastructure.
What is Free CAD?
FreeCAD is an open-source, multiplatform 3D parametric modeler licensed under LGPL-2.1, designed for creating precise, reusable mechanical designs. It enables users to build complex geometries using parametric constraints, allowing modifications to be propagated across the entire model. Engineers, architects, and product designers leverage FreeCAD to tackle tasks requiring accuracy and flexibility, such as mechanical assembly modeling or architectural visualization. The tool addresses challenges in traditional CAD workflows by offering a collaborative, extensible platform that balances simplicity with advanced features, supported by a global community of developers and users. By integrating scripting, modular workbenches, and a API, FreeCAD caters to both beginners and professionals. Its parametric approach ensures that changes to one element automatically update related components, reducing errors in iterative design processes. The project’s open-source nature fosters innovation, with contributions from individuals and organizations worldwide. FreeCAD’s emphasis on customization and extensibility makes it a versatile tool for industries ranging from aerospace to education, where precise 3D modeling is critical. The project relies on donations and sponsorships to sustain development, with funding directed toward improving performance, expanding features, and ensuring long-term stability. While it may not rival commercial CAD software in all aspects, FreeCAD’s commitment to open standards and community-driven growth positions it as a viable alternative for specific design needs.
How it works
FreeCAD is a free and open-source 3D parametric modeler, developed as a collaborative effort under the LGPL-2.1 license. It provides a platform for creating, modifying, and analyzing complex 3D geometries through parametric constraints, ensuring design changes propagate throughout the model. The tool is primarily used by mechanical engineers, architects, and product designers who require precise, reusable models for tasks such as mechanical assembly design, architectural detailing, or custom fabrication. Its parametric workflow streamlines iterative design processes, reducing manual adjustments and errors. FreeCAD supports 3D modeling through modular workbenches, including tools for Part Design, Drafting, and Finite Element Analysis. Users can define geometric relationships, apply constraints, and generate complex shapes programmatically via Python scripting. The GitHub repository (FreeCAD/FreeCAD) hosts its source code, enabling developers to contribute plugins or customize workflows.
How to use it
- 1Download and install FreeCAD from its official website or package repositories. 2. Launch the application and create a new document via the 'File' menu. 3. Select a workbench (e.g., 'Part Design') from the toolbar to access modeling tools. 4. Use the 'Create' menu to generate basic shapes like extrusions or revolutions, then apply constraints to define relationships between elements. Practical tips: Use the 'Draft' workbench for 2D sketches that convert to 3D solids. For complex assemblies, employ the 'Assembly' workbench to manage component interactions. Regularly save work and explore the 'Help' menu for tutorials on specific tasks.
What it can do
- parametric 3D CAD
Use cases
Assumptions and limitations
Assumptions
- source: https://github.com/FreeCAD/FreeCAD
- license: LGPL-2.1 — free to use
- privacy: Self-hosted — you control your data
Limitations
- Limited real-time rendering capabilities compared to commercial CAD software
- Steep learning curve for mastering advanced parametric workflows
- Dependence on system resources for complex simulations or large assemblies
- Fewer built-in plugins compared to proprietary alternatives like SolidWorks
- Community-driven development may result in slower feature adoption
Understanding the result
Open-source parametric 3D modeler for mechanical engineering and product design.
Tool details
- Clearly flagged when a network request is needed.
- No account, no sign-up, and no tracking of your content.
- Powered by (MIT).
- Built with
- (FreeCAD/FreeCAD)
- License
- MIT
- Runs locally
- No — requires a network request
- Verification
- Not yet verified
- Input
- Query
- Output
- Text
Built with FreeCAD/FreeCAD. OpenToolVault provides the discovery and browser interface while crediting the original project maintainers.
- Built with
- License
- MIT
Open-source project
OpenToolVault is an independent directory. We are not affiliated with or endorsed by this project.
References
- / — GitHub Repository
Upstream project · GitHub
- LGPL-2.1 License
Upstream project
Frequently asked
What is FreeCAD and what problems does it solve?
FreeCAD is an open-source 3D parametric modeler that enables precise, reusable design through constraints and relationships between geometric elements. It solves problems in mechanical engineering, architecture, and product design by streamlining iterative workflows, reducing manual adjustments, and allowing complex assemblies to be modified efficiently. Its parametric approach ensures changes to one component automatically update related parts, minimizing errors in design processes.
How does FreeCAD's parametric modeling work?
FreeCAD uses a relational database of geometric constraints to define how elements interact. When a user modifies a dimension or shape, the software recalculates dependent elements based on predefined relationships. This is achieved through a combination of direct geometry manipulation, scripting (Python), and modular workbenches that handle specific tasks like Part Design or Drafting. The system ensures consistency across the model, even when complex modifications are made.
How do I create a simple bracket using FreeCAD?
1. Open FreeCAD and select the 'Part Design' workbench. 2. Create a new document and use the 'Create' menu to extrude a rectangular sketch into a 3D solid. 3. Use the 'Pad' tool to form the main body of the bracket. 4. Add a 'Cut' operation to create holes for mounting. 5. Apply constraints to define dimensions and relationships between features. 6. Save the model and export it as STL for 3D printing or other applications.
How does FreeCAD compare to Fusion 360 or Blender?
FreeCAD focuses on parametric, industrial-grade 3D modeling with a strong emphasis on extensibility and open-source collaboration. Fusion 360 offers cloud-based CAD, CAM, and CAE tools with integrated simulation capabilities, making it more suited for professional workflows with cloud integration. Blender is a 3D creation suite with robust modeling and animation tools but lacks FreeCAD's specialized parametric constraints for engineering design. Each tool excels in different domains: FreeCAD for precise mechanical design, Fusion 360 for integrated product development, and Blender for artistic 3D content.
What should I do if FreeCAD's interface doesn't load?
If the interface fails to load, check for missing dependencies like the Qt library or incompatible graphics drivers. Verify that your system meets the minimum requirements listed on the FreeCAD website. If using a package manager, ensure all dependencies are installed correctly. Review the application logs for error messages, which can be found in the 'Help' menu under 'Debug Output.' Reinstalling the software or switching to a different installation method (e.g., from GitHub) may resolve the issue.