{
  "schema": "tesign-radar/item/1",
  "generated_at": "2026-09-17T01:56:13.055Z",
  "lang": "en",
  "slug": "partmode",
  "url": "https://tesign.com/en/item/partmode/",
  "alternates": {
    "ko": {
      "html": "https://tesign.com/item/partmode/",
      "json": "https://tesign.com/item/partmode/index.json",
      "markdown": "https://tesign.com/item/partmode/index.md"
    },
    "en": {
      "html": "https://tesign.com/en/item/partmode/",
      "json": "https://tesign.com/en/item/partmode/index.json",
      "markdown": "https://tesign.com/en/item/partmode/index.md"
    }
  },
  "name": "PartMode",
  "use_label": "Mechanical CAD in the browser",
  "one_liner": "Parametric mechanical CAD in the browser: constrained sketches, assemblies, drawings, STEP",
  "text": {
    "why": "In PartMode the shaded three.js scene is only a view; the geometry itself is exact B-rep evaluated by OpenCascade WebAssembly. It offers constrained sketches, editable feature history, assembly mates, hidden-line drawings (SVG and PDF), STEP import and export and STL, AMF and 3MF output without a desktop CAD installation. You can model anonymously at partmode.com with projects kept in browser storage, and coding agents work on the same document model through typed operations: in a browser-approved session they commit only changes a person has approved, while unattended work needs a separate, explicitly granted headless key.",
    "take": "Browser CAD with exact B-rep and STEP exchange, and agent access that defaults to human approval.",
    "build": [
      "Keep parts that only change in dimension, such as packaging jigs, brackets or enclosures, as templates and hand STEP files to your machine shop, or connect a coding agent over MCP so it takes dimensions and runs preview → approval → export."
    ],
    "who": [
      {
        "role": "Small manufacturers and prototypers",
        "situation": "model parts without an install and send STEP to the machine shop"
      },
      {
        "role": "Makers and 3D-printer owners",
        "situation": "sketch → solid → STL/3MF export"
      },
      {
        "role": "Agent developers",
        "situation": "automate typed CAD operations over MCP"
      }
    ],
    "start": [
      {
        "command": false,
        "text": "# No install: https://partmode.com (no account needed)"
      },
      {
        "command": false,
        "text": "git clone https://github.com/BOMWiki/partmode.git"
      },
      {
        "command": false,
        "text": "cd partmode"
      },
      {
        "command": false,
        "text": "npm ci"
      },
      {
        "command": false,
        "text": "npm run build"
      },
      {
        "command": false,
        "text": "npm start   # http://127.0.0.1:4401"
      }
    ],
    "caveat": [
      "Licence AGPL-3.0-only: modify it and offer it as a network service and you must publish your source. partmode.com needs no account, but projects live only in browser storage, so backups are on you.",
      "Self-hosting requires Node.js 22.13 or newer. Agent (MCP) access needs an account and a revocable key, and the README notes the hosted relay is not end-to-end encrypted.",
      "No simulation, CAM, native DWG authoring or certified GD&T, and imported STEP does not reconstruct the original feature history. Copyright is held by Sphinx (2026)."
    ]
  },
  "cta": {
    "type": "try",
    "label": "TRY",
    "url": "https://partmode.com/"
  },
  "ready": "browser",
  "categories": [
    "design"
  ],
  "categories_confirmed": true,
  "tags": [
    "cad",
    "parametric",
    "opencascade",
    "webassembly",
    "step",
    "mcp"
  ],
  "platform": [
    "web"
  ],
  "license": {
    "spdx": "AGPL-3.0",
    "scope": "copyleft",
    "scope_text": "Release source if you redistribute or host it as a service.",
    "url": "https://spdx.org/licenses/AGPL-3.0.html",
    "note": null,
    "open_source": true
  },
  "language": "JavaScript",
  "source_urls": {
    "canonical": "https://partmode.com/",
    "github": "https://github.com/bomwiki/partmode",
    "huggingface": null,
    "app_store": null,
    "sightings": [
      {
        "source": "github",
        "url": "https://github.com/bomwiki/partmode",
        "posted_at": "2026-08-07T16:00:00.000Z",
        "hn_url": null
      }
    ]
  },
  "numbers": {
    "as_of": "2026-09-16T21:00:00.000Z",
    "stars": 526,
    "stars_unit": "GitHub stars",
    "stars_checked_at": "2026-09-15T19:34:47.162Z",
    "stars_observed_since_check": 0,
    "star_delta_24h": null,
    "star_delta_7d": null,
    "star_delta_30d": null,
    "star_delta_unit": "GitHub stars gained in the window, GH Archive events summed to as_of",
    "spark_14d": [
      null,
      null,
      null,
      null,
      null,
      null,
      null,
      null,
      null,
      null,
      null,
      null,
      null,
      null
    ],
    "hf_likes": null,
    "hf_likes_observed_at": null,
    "hn_points": null,
    "hn_points_observed_at": null,
    "store": null,
    "method": "Star total = the value last checked on GitHub (stars_checked_at) + increases observed via GH Archive since. The 24h · 7d · 30d gains are GH Archive hourly events summed to the reference time (as_of). No score of ours."
  },
  "ranks": null,
  "activity": {
    "pushed_at": "2026-08-17T16:55:51.000Z",
    "owner_type": "Organization",
    "open_issues": 11,
    "contributors": 1,
    "releases_count": 1,
    "latest_release": {
      "tag": "source-snapshot-2026-08-11",
      "published_at": "2026-08-10T16:36:53.000Z",
      "prerelease": true
    },
    "checked_at": "2026-09-15T19:34:47.162Z",
    "core_checked_at": "2026-09-15T19:34:47.162Z"
  },
  "signals": [
    {
      "kind": "back",
      "label": "BACK CATALOG",
      "value": null
    }
  ],
  "images": {
    "og": "https://tesign.com/img/partmode-fbd032813a.png",
    "cover": "https://tesign.com/img/partmode-fbd032813a.png",
    "cover_width": 2400,
    "cover_height": 1260,
    "gallery": [
      "https://tesign.com/img/partmode-fbd032813a.png"
    ],
    "alt": "The PartMode social preview: 'Browser CAD for people + typed agents' with LOCAL-FIRST, EXACT B-REP and STEP badges on the left, and on the right the Studio with a 3D Tools ribbon (Extrude, Cut, Hole Wizard, Thread), a model tree, a plate with a hole in the viewport and an Agent Flight Recorder inspector",
    "tier": 1
  },
  "dates": {
    "first_seen_at": "2026-09-13T09:14:23.726Z",
    "source_created_at": "2026-08-06T04:51:12.000Z",
    "discovery_hours": 916.3865905555556,
    "launch_signal_at": "2026-08-07T16:00:00.000Z",
    "kept_at": "2026-09-14T19:27:43.646Z",
    "first_published_at": "2026-09-14T19:27:43.752Z",
    "updated_at": "2026-09-15T04:36:56.954Z",
    "ingestion_mode": "backfill"
  },
  "notes": [
    "This file was produced by the same build, from the same data, as the tesign.com item page. The text is editorial; the numbers are stored observations.",
    "null in the JSON means not observed — never zero. The Markdown writes [unconfirmed] for it.",
    "Star total = the value last checked on GitHub (stars_checked_at) + increases observed via GH Archive since. The 24h · 7d · 30d gains are GH Archive hourly events summed to the reference time (as_of). No score of ours.",
    "Reconstructed from archive data, not a live discovery.",
    "A summary, not legal advice."
  ]
}