Direct editing
Push and pull faces. Grab an edge and fillet it. Nothing asks you to plan a feature tree before you know what you are making, and nothing breaks three steps later because an early sketch moved.
Private beta · macOS
CAD that gets
out of the way.
Smew is a direct 3D modeller for people who want to make a part, not learn a parametric tree. Sketch a profile, pull it into a solid, fillet the edge you can see. Export something your slicer respects.
Free during the beta · macOS 15 or later · Apple silicon
Extrude — One-Sided
Solid modellingOpenCASCADE kernel
STEP · STL · OBJ · glTFExports that open elsewhere
Runs on your MacNo cloud, no account
Your files stay yoursLocal documents
Built for making a part, not managing a model
Sketches with real constraints
Draw loosely, then pin what matters — coincident, tangent, equal, dimension. The solver settles the rest, so a rough profile becomes an exact one without redrawing it.
An assistant that can actually build
Describe the part and Smew's assistant performs the operations itself — it does not write you a list of steps to follow by hand. Run it against a local model on your own machine, or connect your own API key.
Finishes, colours and texture
Per-face colour and surface finish, relief and lithophane tools for turning an image into geometry. What you see shaded is what the exporter writes.
Exports that behave
STEP for the next CAD package, STL and 3MF for the printer, OBJ and glTF for everything else. Mesh density you control, so a curve stays a curve.
Works with your tools
Smew speaks the Model Context Protocol, so assistants like Claude can read and drive the document directly — the same tool surface the in-app assistant uses.
Platforms
Smew is a Mac app today. The others are being built, and the beta is what decides their order.
WindowsIn development
The modelling kernel and interface are already cross-platform. The build is in progress.
Get notifiediPadPlanned
A touch-first version is planned, not started. Tell us if it is the one you want.
Register interestDownload the beta
Free while it is in beta. It is a real modeller, not a demo — but it is early, and it will have rough edges.
Download Smew 0.1.0 betamacOS 15 (Sequoia) or later · Apple silicon (M1 or newer) · 50 MB disk image
SHA-256
64841f54d59d6f728668f8fc0117da84c08293cfbb45cc0c8241692027270c49
Verify with shasum -a 256 Smew-0.1.0-beta.dmg if you want to
check the download arrived intact.
One extra step the first time
Smew is not yet notarised with Apple — that needs a paid developer account we have not bought until the beta says it is worth it. So macOS will refuse the first launch. Nothing is wrong with your Mac.
- Double-click Smew. macOS refuses. Dismiss the message.
- Open System Settings → Privacy & Security.
- Scroll down to the line about Smew, and click Open Anyway.
- Smew opens. You will not have to do this again.
The same steps are in Read Me First on the disk image.
What would help us most
Anything that crashes, hangs or loses your work comes first. After that, anything you expected to do and could not find, and any export your slicer mangles.
In the app, Help → Send Feedback attaches the session log and shows you exactly what it contains before anything is sent.