3D CAD software lets you create and change three-dimensional designs on a computer. Engineers and designers use it to make parts, products, machines, and other objects before they are built.
The best CAD software is the one that fits your budget, you work and can be easily in your budget. Some programs are made mainly for mechanical engineering, while others focus on cloud collaboration, freeform design, or advanced engineering.
10 Best 3D CAD Software
| Software | Best for | Main modeling style | Price* |
|---|---|---|---|
| Autodesk Fusion | Product design and manufacturing | Parametric, direct, surface | $680/year |
| SOLIDWORKS | Mechanical engineering | Parametric, solid, surface | From $2,820/year |
| Onshape | Cloud CAD and teamwork | Parametric, solid, surface | From $1,500/user/year |
| Autodesk Inventor | Mechanical product design | Parametric, direct, freeform | $2,585/year |
| PTC Creo | Advanced engineering | Parametric, direct | Custom |
| FreeCAD | Free 3D CAD | Parametric, solid | Free |
| Rhino | Surface and industrial design | Surface, solid, NURBS | $995 one-time |
| Shapr3D | Simple direct modeling | Direct, solid, surface | Free; Pro $299/year |
| CATIA | Complex engineering | Parametric, surface, solid | Custom |
| Siemens Designcenter | Large engineering teams | Parametric, direct, surface, solid | Custom |
*Prices are U.S. prices where publicly listed and can change.
1. Autodesk Fusion — Best for Product Design
Autodesk Fusion is a 3D CAD program that combines design, manufacturing, simulation, electronics, and data management tools.
It supports several ways of creating models, including parametric and direct modeling. It is useful for product design, prototypes, 3D printing, and manufacturing.
Fusion costs $680 per year in the U.S. Autodesk also offers a free Personal Use option for qualifying non-commercial users.
If you want more information, see our Autodesk Fusion guide.
Best for: Product designers, engineers, makers, and small manufacturing teams.
2. SOLIDWORKS — Best for Mechanical Engineering
A popular 3D CAD program for mechanical design. It is used to create parts, assemblies, and technical drawings.
Its parametric tools let you change dimensions and features while keeping the model connected.
SOLIDWORKS Design currently costs $2,820/year for Standard, $3,456/year for Professional, and $4,716/year for Premium in the U.S.
Best for: Mechanical engineers and teams designing machines, products, and equipment.
3. Onshape — Best for Cloud CAD and Teamwork
Onshape is a cloud-based 3D CAD program. It runs through the web and is designed for teams that need to work together on the same designs.
It includes version control and design data management, which helps teams keep track of changes.
Onshape has a free plan for non-commercial use, but its documents are public. Paid plans start at $1,500/user/year for Standard and $2,500/user/year for Professional.
Read our Onshape guide for more details.
Best for: Teams that want browser-based CAD and easy collaboration.
4. Autodesk Inventor — Best for Mechanical Product Design
Autodesk Inventor is a 3D CAD program made for mechanical design and engineering.
It can be used to create parts and assemblies and includes tools for sheet metal, frames, tube and pipe design, and technical drawings.
Inventor currently costs $2,585/year in the U.S.
See our Autodesk Inventor guide for more information.
Best for: Mechanical engineers designing machines, equipment, and products.
5. PTC Creo — Best for Advanced Engineering
PTC Creo is a 3D CAD program for detailed product design and engineering.
It uses parametric modeling and includes tools for areas such as simulation, generative design, and manufacturing.
Creo has different packages and licensing options, so PTC does not provide one simple price that applies to every user.
Read our Creo software guide to learn more.
Best for: Engineering teams working on complex products.
6. FreeCAD — Best Free 3D CAD Software
FreeCAD gives you a no-cost way to create and edit 3D models, with its source code available as open source. It uses parametric modeling, which means you can change dimensions and other settings to update your model.
It can be used for mechanical parts, product designs, prototypes, and 3D printing.
There is no commercial license fee for using FreeCAD.
Our FreeCAD guide covers its features and requirements in more detail.
Best for: Students, beginners, hobbyists, and users who need free 3D CAD.
7. Rhino — Best for Surface Modeling
Rhino is a 3D modeling program known for creating smooth and complex shapes.
It is commonly used in industrial design, architecture, jewelry, product design, and other areas where the shape of an object is important.
Rhino uses NURBS modeling, which is well suited to creating accurate curves and surfaces.
A commercial Rhino license in North America currently costs $995 as a one-time purchase.
Best for: Industrial designers and users who need detailed surface modeling.
8. Shapr3D — Best for Easy Direct Modeling
Shapr3D is a 3D CAD program built around direct modeling. You can use Shapr3D across Windows PCs, Macs, and iPads, so the same CAD workflow can move between desktop and tablet.
Its interface is designed to make creating and changing models quick and simple.
Shapr3D has a free Basic plan. The Pro plan costs $299 per Editor seat per year when billed annually.
Best for: Product designers, engineers, and users who want simple direct modeling on multiple devices.
9. CATIA — Best for Complex Products
CATIA is an advanced CAD and engineering platform from Dassault Systèmes.
It is used for complex product design and engineering, including work in aerospace, automotive, and other large industries.
CATIA supports solid modeling, surface modeling, and other advanced design tools.
Pricing depends on the selected products and license, so there is no single price for all CATIA users.
Best for: Large engineering organizations working on complex products.
10. Siemens Designcenter — Best for Large Engineering Teams
Siemens Designcenter is the current name for the CAD software formerly known as Siemens NX. The name changed the name with its June 2026 release.
Designcenter provides tools for detailed 3D design and can connect CAD work with manufacturing and other engineering processes.
Pricing depends on the selected software and license.
Best for: Large engineering teams and companies working on complex products.
How to Choose 3D CAD Software
Choosing 3D CAD software becomes easier when you start with your actual work.
For mechanical engineering
Look for strong tools for parts, assemblies, dimensions, and technical drawings.
SOLIDWORKS, Inventor, Fusion, and Creo are examples of software that can handle these jobs.
For product design
Product designers may need both solid and surface modeling, along with tools for creating and changing designs quickly.
Fusion, SOLIDWORKS, Rhino, and Shapr3D can fit different product-design workflows.
For team collaboration
If several people need to work on the same designs, cloud-based software can make sharing and tracking changes easier.
Onshape is built around this type of workflow.
For advanced engineering
Complex products may need advanced modeling and engineering tools.
Creo, CATIA, and Siemens Designcenter are designed for more demanding engineering work.
For free 3D CAD
If you do not want to pay for CAD software, FreeCAD is a strong starting point.
Onshape also has a free plan, but it is for non-commercial use and its documents are public.
3D CAD vs. 2D CAD
The main difference is simple.
2D CAD creates flat drawings using lines, shapes, dimensions, and notes.
3D CAD creates models with height, width, and depth.
3D CAD is useful when you need to see how parts fit together or when you are designing a three-dimensional product.
2D CAD is still useful for technical drawings and other projects that do not need a full 3D model.
Many CAD programs support both 2D and 3D work.
What Is 3D CAD Used For?
3D CAD software is commonly used for:
- Mechanical parts
- Machines and equipment
- Product design
- Assemblies
- Prototypes
- 3D printing
- Manufacturing designs
- Industrial design
The exact tools you need depend on the type of work you do.
Frequently Asked Questions
What is 3D CAD software?
3D CAD software is software used to create and change three-dimensional designs on a computer. Engineers and designers use it to design products, parts, machines, and other objects.
What is the best 3D CAD software?
There is no single best program for everyone. SOLIDWORKS and Inventor are strong choices for mechanical engineering, Fusion is useful for product design and manufacturing, Onshape is suited to cloud collaboration, and FreeCAD is a free option.
Is 3D CAD software free?
Some 3D CAD programs are free. FreeCAD is free and open source. Onshape also has a free plan, but it has limits and is intended for non-commercial use.
Is 3D CAD used in mechanical engineering?
Yes. Mechanical engineers use 3D CAD to design parts, machines, assemblies, tools, and equipment.
Can 3D CAD software be used for 3D printing?
Yes. A 3D CAD program can be used to create the model that will later be prepared for 3D printing.
What is parametric 3D CAD?
Parametric 3D CAD uses dimensions and rules to control a model. When you change an important dimension, related parts of the model can update automatically.
Final Thoughts
3D CAD software makes it possible to create and change detailed 3D designs before they are built.
For mechanical engineering, SOLIDWORKS and Autodesk Inventor are established options. Fusion provides CAD and manufacturing tools in one platform, while Onshape focuses on cloud-based design and teamwork. FreeCAD is a free and open-source option.
For more advanced work, Creo, CATIA, and Siemens Designcenter offer tools for complex engineering projects. Rhino is useful for surface modeling, while Shapr3D focuses on simple direct modeling across devices.
The right choice depends on your type of work, required features, budget, and how you want to work.