Takumion
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NewModel parameters and sketch text are here →

Parametric CAD. In your browser.

Sketch, constrain and build 3D parts with a feature history you can always step back into. Change one number and the whole part follows.

Start modelling — freeWatch it workModel with an AI agent

Browser · Windows / macOS / Linux desktop coming

The full editor demo needs a wider screen. Drag to change the part.

How a part is made

Every part is a recipe you can edit.

Takumion keeps the steps, not just the shape. That is why you can change your mind later.

  1. 01 / SketchConstrain your sketch.Lines, arcs, splines and text on a plane. Each closed loop becomes a profile; a loop inside a loop is a hole.
  2. 02 / BuildBuild a solid.Extrude, revolve, sweep or loft a profile. Each feature saves its inputs.
  3. 03 / RefineEdit earlier features.Fillet, shell, draft. Step back in the timeline and everything after rebuilds.
  4. 04 / ExchangeImport and export files.STEP, IGES, DXF and SVG in. STEP, STL, 3MF and more out.

Parameters

Change a dimension. Rebuild the model.

Name the numbers that matter and drive every feature from them. Try it: move a slider.

Rebuilt Sketch1 → Extrude1 → Fillet1

160 × 100 × 40 · ⌀40

In the viewport

See the result before you press OK.

Every feature previews in the colour of what it will do. Hover anything and it tells you what it is.

Join · 40 mm

Green adds material to the body it touches.

Face 3Planar face160 × 100 mm

Pick what you want to select. The chip names it and measures it before you click; Shift adds, Esc clears.

Make it yours

Five accent themes, light and dark.

ExtrudeFilletShellSketch1 · editing

Coming · Tablet and phone

Model on a tablet.

A layout made for touch, for your left or right hand. The pen draws, fingers move the view.

  • Long-press for a radial menu of likely next commands
  • Two-finger tap undoes, three-finger tap redoes
  • Type values on a number pad
  • Swipe in from the edge for the Browser

On the roadmap · AI & MCP

Model with an AI agent.

Connect an assistant through MCP and it works the same app API you do. Every step lands in your timeline where you can edit it.

BuildInspectReviseExport

AI is optional. Takumion works fully without an assistant.

See the AI plans

Add four M3 mounting holes, 6 mm in from each corner.

  • sketches.create({ face: top })
  • sketch.circle() × 4, ⌀3.4
  • features.extrude({ operation: cut, extent: all })

Done: four through holes in a new Extrude2. Change the inset from the timeline.

Proof

Made with Takumion.

The Takumion editor showing a mounting plate with four bolt holes, a centre bore and rounded corners; the hover chip reads Face5, Planar, 8,891.6 mm²
The real editor: a mounting plate in three features — Plate outline, Extrude1, Fillet1. Hovering the top face shows its area.
Animation: an empty project, then the plate sketch, the extrude, and the filleted plate

From a sketch to a solid

Sketch, extrude, fillet. Recorded in the editor.

Sketch mode: the plate outline from the top, with ⌀24 and ⌀8 dimensions, a 17 DOF counter and the Sketch Palette

Sketch mode

Dimensions on the curves and a live count of what can still move.

The engine

Real B-rep geometry, in a browser tab.

Takumion runs the Open CASCADE kernel compiled to WebAssembly, so a fillet is an exact surface, not a mesh trick. The desktop app will run the same model on a native build for heavier parts. Your files stay on your machine.

Recently shipped

New in Takumion

  • Model parameters and expressions
  • Text in sketches
  • More sweep and loft options
  • Insert another part into a design

Open a blank part. It takes a second.

No download and no licence server. Free needs only an account.

Create an accountCompare plans