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AI-native parametric CAD

Design beyond your skill. Build beyond your hours.

Whether it's your first bracket or your hundredth assembly, an assistant sketches, builds, and animates — handling the parts you'd rather skip. In your browser.

Start freeSee how it works

Free tier · No install · Open in a tab and start modeling.

  • Pro engineOpen CASCADE — the kernel the desktop seats run on.
  • 0 installsOpen a tab. You're already modeling.
  • 1 undoYour edits and the AI's, on the same stack.
  • Any shopSTEP, DXF, PDF, STL, 3MF — the files real shops accept.
What kerf is

A complete CAD environment. Without the install.

kerf is not a mesh viewer with chat bolted on. It's a full modeling, drawings, assemblies, and analysis suite a working pro needs — with an AI assistant that edits the same model you do.

How it works

Build it by hand. Or ask the assistant. Same model, same history.

You and the assistant edit the same parametric stack. Nothing the agent does is something you couldn't have done yourself — and nothing is unreviewable.

  1. Sketch with real constraints.

    Pick a plane or a face, place geometry, drop coincident / parallel / tangent / equal / distance / angle / radius constraints. The solver keeps your sketch consistent as you drag.

  2. Build a parametric stack.

    Extrude, revolve, sweep, loft, fillet, chamfer, shell, hole, draft, pattern, mirror, boolean. Every feature is editable in place; reorder with drag-and-drop.

  3. Ask the assistant to do the rest.

    Hand off the tedious passes — chamfering an outer loop, dropping a hole pattern, mirroring a feature set. Streamed plan, live tool calls, one undoable op per step.

  4. Ship the file your shop needs.

    Real drawings — title block, hidden lines, sections, GD&T frames — that a machinist or printer accepts without rework.

The AI engineer

Not chat. Real model edits, on a real diff.

The assistant calls the same tools the UI calls. Ops stream into your viewport as they land — plan, tool calls, and a single accept-or-reject diff at the end.

Pricing

One product. Honest meters. No format paywall.

$10/month for the app, pay-as-you-go for AI, $5/month per active collaborator. Public-domain mode is $0 forever.

Public

$0forever

Free forever — the catch is your work is public.

  • $0/month — no card, no time limit
  • AI: bring your own OpenAI / Anthropic key ($0), or top up pay-as-you-go from $5
  • $0 per collaborator (your docs are public anyway)

Tradeoff: every doc is public-domain (CC-BY 4.0).

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$10per month

$10/month for the app. You only pay for the AI you actually use.

  • $10/month flat app fee
  • AI: pay-as-you-go (capped at your monthly $ ceiling) — or bring your own key for $0
  • +$5/month per active collaborator

Default AI ceiling: $25/month. Raise, lower, or set to $0 (BYO-only) any time.

Start now

Full details on the pricing page. Enterprise & self-host: talk to us.

FAQ

The questions a working engineer asks first.

  • Real CAD. kerf runs Open CASCADE — the same modeling engine SolidWorks, Onshape, and Fusion use — both on the server and in your browser (compiled to WebAssembly, in a worker). STEP imports preserve topology IDs, sketches are fully constrained, and exports are real solids.