⚙ cycleCAD

Open-source browser CAD with a B-Rep kernel. Real solid modeling. Real fillets. Real booleans. No install. No login. Free forever.

Open App · Source · Docs · npm

What is this

cycleCAD is a parametric 3D CAD modeler that runs entirely in the browser. It uses OpenCascade.js (WASM) as a real B-Rep solid modeling kernel — the same geometry engine behind FreeCAD and KiCad.

Type motor mount plate with 4 bolt holes into the AI copilot and get a real 3D solid in seconds.

How it compares

| | cycleCAD | OnShape | Fusion 360 | FreeCAD | |---|---|---|---|---| | Runs in browser | ✅ Yes | Cloud | Desktop | Desktop | | Cost | Free | $1,500/yr | $545/yr | Free | | Text-to-CAD | ✅ Yes | No | No | No | | B-Rep kernel | OpenCascade.js | Parasolid | Parasolid | OpenCascade | | Multiplayer | WebRTC P2P | Paid | No | No | | Inventor files | .ipt/.iam native | No | Yes | No | | Open source | MIT | No | No | LGPL | | Mobile viewer | ✅ Yes | No | No | No |

Get started

Browser — open cyclecad.com/app and start designing.

npm:

npm install -g cyclecad
cyclecad

Clone:

git clone https://github.com/vvlars-cmd/cyclecad.git
cd cyclecad && npm run dev

12 Killer Features

• ⚡ Text-to-CAD — Natural language to 3D geometry with live preview
• 📷 Photo-to-CAD — Phone photo to parametric model via edge detection + AI
• 🏭 Manufacturability (DFM) — Instant feedback for 9 processes, 20+ materials
• 🧬 Generative Design — SIMP topology optimization with live voxel visualization
• 🔬 Multi-Physics Simulation — FEA, thermal, modal, drop test — all in-browser
• 🔩 Smart Parts Library — 200+ standard parts with AI-powered fuzzy search
• 🧲 Smart Assembly Mating — Auto-detect 8 constraint types, motion study
• 🤖 Auto-Assemble Parts — AI geometry fingerprinting, one-click assembly
• 📊 Parametric from Example — Upload variants, AI infers parameters
• 📡 Digital Twin Live Data — IoT sensors (MQTT/REST/WebSocket) on 3D model
• 🖨️ Machine Control — G-code generator for FDM, CNC, laser. OctoPrint/Klipper
• 📓 Engineering Notebook — Auto-logs every design action, AI summaries

Agent API

cycleCAD is built for AI agents. 55 commands across 10 namespaces via JSON-RPC.

// In browser
await kernel.exec('ops.box', { width: 100, height: 50, depth: 30 });
await kernel.exec('ops.fillet', { edges: [0, 1, 2], radius: 5 });
await kernel.exec('step.export', { filename: 'part.step' });

# Via MCP server
npx cyclecad-mcp

# Via CLI
cyclecad ops.box --width 100 --height 50 --depth 30

# Via REST API
curl -X POST http://localhost:3001/api/exec \
  -d '{"command": "ops.box", "params": {"width": 100}}'

Docker

docker compose up  # starts cycleCAD + STEP converter + ExplodeView

Features

Modeling — Parametric sketcher with 17 tools, 12 constraint types. Extrude, revolve, sweep, loft, shell, fillet, chamfer, boolean, pattern, mirror, draft, hole, thread, rib.

B-Rep Kernel — Real solid geometry via OpenCascade.js WASM. True edge fillets and chamfers. Real boolean operations. STEP import/export.

Drawing — 2D engineering drawing workspace with orthographic views, section views, detail views, GD&T, title blocks, BOM tables. Export to PDF, DXF, SVG.

Simulation — Static stress (FEA), thermal, modal frequency, buckling. Material library. Color-coded results with safety factor plots.

Assembly — 7 joint types, joint limits, animation, interference detection, exploded views, motion study, auto-generated BOM.

AI — Text-to-CAD, part identification, manufacturing cost estimation, auto-generated assembly instructions, maintenance scheduling.

Export — STL (ASCII + binary), OBJ, glTF 2.0, STEP, DXF, PDF. G-code preview. 3D print slicer integration.

Platform — Chrome, Safari, Firefox, Edge. Offline via IndexedDB. Mobile touch viewer. 50+ keyboard shortcuts. Multi-language (EN/DE/FR/ES/IT/NL).

Pricing

| Free | Pro €49/mo | Enterprise €299/mo | |---|---|---| | All 12 killer features | Everything in Free | Everything in Pro | | Text-to-CAD + Photo-to-CAD | STEP import/export | Self-hosted deployment | | DFM + simulation | Real-time collaboration | SSO / SAML | | 200+ standard parts | Cloud storage | SLA guarantee | | STL/OBJ/glTF export | Machine control | MCP server + REST API |

Contributing

git clone https://github.com/vvlars-cmd/cyclecad.git
cd cyclecad && npm run dev

Pick a good-first-issue, make changes, open a PR.

License

MIT © Sachin Kumar

Built for cycleWASH — designing real production machines with 400+ parts.