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"CAD software" is a broad label covering tools built for very different disciplines. Picking based on brand recognition alone is a common (and expensive) mistake — here's how the three most-searched options actually differ.
AutoCAD: general-purpose 2D and 3D drafting
AutoCAD is the most flexible of the three — strong 2D drafting, decent 3D modeling, and broad industry acceptance across civil engineering, general drafting, and any field that still exchanges DWG files as the standard format. If your work spans multiple industries or you need a tool that's universally accepted as an input/output format, AutoCAD is the safer general pick.
Revit: built specifically for building information modeling
Revit isn't a general CAD tool — it's purpose-built for architecture, structural, and MEP (mechanical/electrical/plumbing) design using BIM (Building Information Modeling), where every element in the model carries real data, not just geometry. If you're doing architectural work, Revit's parametric families and automatic coordination between plans, sections, and schedules will save far more time than adapting AutoCAD to the same task.
SolidWorks: mechanical and product design
SolidWorks is the standard for mechanical engineering and product design — parametric 3D modeling built around assemblies, tolerances, and manufacturing output (drawings, simulations, sheet metal). If you're designing a physical product that will be manufactured, SolidWorks' simulation and assembly tools are built for exactly that workflow in a way AutoCAD isn't.
What about Maya or Cinema 4D?
Worth flagging: none of these three are the right tool for character animation or visual effects work — that's a separate category covered by tools like Autodesk Maya in Specialized-Professional Software, built for entertainment and animation pipelines rather than engineering documentation.
File compatibility with collaborators matters
If you're working with contractors, clients, or contributors who use a different tool than you do, check file compatibility before committing — AutoCAD's DWG format remains the most universally importable across other CAD tools, while Revit and SolidWorks files are more tool-specific and typically need to be exported to a neutral format (like IFC or STEP) to share outside their native ecosystem.
Licensing model is also worth checking directly — all three vendors have shifted toward subscription-based licensing over outright perpetual licenses in recent years, which changes the long-term cost calculation compared to older one-time-purchase software you may be used to from years past.
Student and educational licensing is available at no or reduced cost for all three from their respective vendors directly, which is worth pursuing first if you're still in school rather than paying full commercial pricing through any reseller.
Hardware requirements scale up noticeably for all three as project complexity grows — a workstation-class GPU is generally recommended for large assemblies or building models rather than a standard consumer laptop, worth checking against your current hardware before committing to a specific tool.
The short version
Architecture and building design: Revit. Mechanical and product design: SolidWorks. General drafting, civil, or cross-discipline work: AutoCAD. Getting this wrong early means relearning a whole workflow later, so match the tool to the actual deliverable your field produces.