A free Fusion 360 alternative with no account at all: browser-based parametric CAD for 3D printing, with editable history, fillets, exact dimensions and STEP export.
OwlCAD gives you editable history, fillets, exact dimensions, STEP, and a print check for overhangs and thin walls, in the browser, free, with nothing to download. Lighter than Fusion and focused on designing parts you’ll actually print.
Free to use · No account needed · Commercial rights on every plan
Competitor details last checked: 4 October 2026
OwlCAD isn’t a full mechanical CAD/CAM suite, with no simulation or toolpaths, but for designing print-ready parts, it covers the ground that counts.
Open a tab and start modeling, with no account at all. Fusion needs an Autodesk sign-in on every route, and its browser version is for paid and education subscriptions, not the free personal-use licence, which is also capped at 10 editable documents.
Re-open a past sketch, boolean, or dimension and the model rebuilds downstream: a real, editable timeline you can scrub.
Type lengths and angles, add constraints, round or bevel single edges, and measure the model itself: hole radius and diameter, true arc length, face area, and the smallest gap between two parts. Precision, not eyeballing.
True millimetres, printer profiles for Ender 3, Prusa, and Bambu Lab, auto-orient, scale-to-fit, watertight checks, hollowing, and repair.
Export solid STEP and import STEP assemblies with their parts, names and colours, plus STL, 3MF, OBJ, GLB, SVG and DXF, so your work flows between OwlCAD and the rest of your CAD tools.
Describe a part and get an editable starting point, parametric or 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.
No download, no account to start. Open the editor and build something printable.
Yes. OwlCAD is a free, browser-based parametric CAD for 3D printing with editable history, fillets, exact dimensions, and STEP export. The full editor is free, with an optional Pro plan that adds AI generation.
No. OwlCAD runs in any modern browser with nothing to download, and you can start modeling without an account. Fusion requires an Autodesk account, its browser version is only for paid and education subscriptions, and its free personal-use licence is non-commercial. OwlCAD grants commercial rights on every plan.
OwlCAD is lighter and focused on designing parts for 3D printing: parametric solids, sketches, booleans, fillets, a print check for overhangs and thin walls, and STEP. It is not a full mechanical CAD/CAM suite like Fusion, and does not include simulation or toolpaths.
Export a STEP, STL, 3MF, or OBJ from Fusion and import it into OwlCAD, with units detected on the way in. A STEP comes in as meshes you can keep building on, an assembly keeping its parts, names and colours.