Tired of Onshape’s free plan making every design public? OwlCAD is free parametric CAD in your browser, private by default. No install, no account to start.
OwlCAD is browser-based parametric CAD with editable history, fillets, exact dimensions, and a print check before you export. The full editor is free, and unlike Onshape’s free plan your projects are private by default, not public.
Free to use · Private by default · No install
Competitor details last checked: 4 October 2026
Everything you need to design for 3D printing in the browser, without putting your work in a public library to use it for free.
Your projects are private the moment you make them, autosave to the cloud, and keep a version history you can roll back. Onshape’s free plan makes every document public, so any Onshape user can view it and make a copy.
Re-open a past sketch, boolean, or dimension and the model rebuilds downstream. A real history timeline you can scrub and retro-edit.
Type lengths and angles as you sketch, add coincident / parallel / distance constraints, and measure the model itself: hole radius and diameter, true arc length, face area, and the smallest gap between two parts.
True millimetres, printer profiles for Ender 3, Prusa, and Bambu Lab, auto-orient, scale-to-fit, overhang and thin-wall checks, watertight checks, hollowing, and mesh repair before your slicer.
Import STL, 3MF, OBJ, GLB, STEP, SVG and DXF, with units detected on the way in. Export a file from Onshape and keep building here.
Describe a part and get an editable starting point: a parametric model or a sculpted mesh. Included with OwlCAD Pro.
OwlCAD runs a hosted MCP server, the standard that lets AI apps such as Claude Code, Claude Desktop or Cursor use outside tools, so your agent can build a part on your account: a real parametric model where every step and dimension stays editable, checked by the CAD kernel and by a render of its own work, handed back as a print-ready file plus a project you can open and edit. Part of Pro, and it spends no AI credits.
Open the editor in your browser and keep your designs your own.
Yes. OwlCAD is a free, browser-based parametric CAD with editable history, fillets, exact dimensions, and a print check before you export. The full editor is free to use, with an optional Pro plan that adds AI generation.
Yes. OwlCAD projects are private by default and autosave to the cloud with version history; you publish a read-only share link only when you choose to. Onshape’s free plan, by contrast, requires your documents to be public.
Yes. Nothing to install, on any modern browser. Geometry is evaluated locally in a Web Worker, and you can start modeling without an account.
Import STL, 3MF, OBJ, GLB, STEP, SVG and DXF, with units detected on the way in. Export a STEP or mesh from Onshape and keep working in OwlCAD.