AI tool comparison
Excalidraw vs FluidCAD
Which one should you ship with? Here is the side-by-side panel verdict, pricing read, reviewer split, and community vote comparison.
Design & Creative
Excalidraw
Hand-drawn style whiteboard for diagrams and brainstorming
100%
Panel ship
—
Community
Free
Entry
Excalidraw is a virtual whiteboard with a distinctive hand-drawn aesthetic. Used by developers for architecture diagrams, system design, and brainstorming. Features real-time collaboration, libraries of shapes, and embeddable components.
Design Tools
FluidCAD
Parametric 3D CAD design using JavaScript code with live viewport
50%
Panel ship
—
Community
Free
Entry
FluidCAD is a web-based parametric CAD application that models geometry through JavaScript code instead of mouse-driven GUI operations. Users write code to define extrusions, fillets, boolean operations, and patterns; dragging in the live viewport generates code values that get locked into the script. It supports STEP file import/export with color, a feature history that can be stepped through and rolled back, and VS Code extension support. Gained 149 upvotes on Show HN today, targeting engineers who want code-first CAD with a traditional feature tree.
Reviewer scorecard
“My go-to for system architecture diagrams. The hand-drawn style makes diagrams feel approachable rather than intimidating. Real-time collab works flawlessly.”
“FluidCAD solves the thing OpenSCAD got wrong: the 'drag to prototype, lock to code' loop makes it accessible without sacrificing programmability. STEP export means it fits into actual hardware workflows, not just rendering. For software engineers doing mechanical work, this is the missing middle ground between Fusion 360's complexity and OpenSCAD's austerity.”
“The aesthetic is the differentiator. Every diagram looks friendly and informal which makes it perfect for presentations, blog posts, and documentation.”
“I appreciate the concept but the UI is clearly built by engineers for engineers. There's no real onboarding, the documentation assumes CAD literacy, and the JavaScript API surface is intimidating for anyone coming from traditional design tools. Until there's a visual-first entry point, this stays a curiosity for most designers.”
“Simple, fast, free. Does one thing well. The library system for reusable components is useful. Not trying to be Figma and that is a strength.”
“Code-first CAD has a 30-year history of failing to reach mainstream adoption because engineers and designers don't want to write JavaScript. FluidCAD will appeal to a very narrow slice of software developers who also do mechanical work. The STEP import/export is table stakes, not a differentiator, and Onshape's API does everything this does for teams who need collaboration.”
“When AI can generate CAD from natural language, the tools that survive will be the ones with programmatic, diffable representations — not binary blob formats. FluidCAD's JavaScript-first approach puts it in exactly the right position for the AI-assisted hardware design wave that's coming. This is the OpenSCAD for the LLM era.”
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