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  2. PartMode

PartMode

Mechanical CAD in the browser

WHO USES ITSmall manufacturers and prototypers · Makers and 3D-printer owners · Agent developers

Use in the browser

Parametric mechanical CAD in the browser: constrained sketches, assemblies, drawings, STEP

★ 526

526 stars · checked on GitHub GitHub check 30 h late · no 7-day star increase observed (GH Archive) (as of )

BACK CATALOG

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

TESIGN TAKE

Browser CAD with exact B-rep and STEP exchange, and agent access that defaults to human approval.

TRY

AT A GLANCE

LICENSE
AGPL-3.0
USAGE
Release source if you redistribute or host it as a service.
LANGUAGE
JavaScript
PLATFORM
web
ACTIVITY
last commit 30 days ago () · latest pre-release source-snapshot-2026-08-11 () · 1 release
COMMUNITY
1 contributor · 11 open issues (incl. PRs) · made by: an organization
SOURCES
GitHub
OPEN SOURCE
YES
FIRST SEEN
CATEGORY
DESIGN

A summary, not legal advice.

WHY IT MATTERS

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.

BUILD FROM THIS

  • 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 IT'S FOR

Small manufacturers and prototypers
model parts without an install and send STEP to the machine shop
Makers and 3D-printer owners
sketch → solid → STL/3MF export
Agent developers
automate typed CAD operations over MCP

START IN 5 MINUTES

# # No install: https://partmode.com (no account needed)
# git clone https://github.com/BOMWiki/partmode.git
# cd partmode
# npm ci
# npm run build
# npm start   # http://127.0.0.1:4401

CAVEATS

  • 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).

RECEIPT

FIRST SEEN
AT SOURCE
KEPT
CREATED → FIRST SEEN
38d
SOURCES
GitHub
◌ BACK CATALOG
Reconstructed from archive data, not a live discovery.

The same facts in machine-readable form — View as Markdown · JSON

SIMILAR TOOLS

Up to five from DESIGN by ★ total: edited entries first, then repository cards; this entry is highlighted. Drawn from the same stored snapshot as the rankings — a comparison, not a recommendation.

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Taste Skill README banner: logo on beige, the tagline 'The Anti-Slop Frontend Framework for AI Agents' and a white UI mock-up.
Taste-SkillFrontend taste for AI agents★ 87.4k▲ +265MITpermissive—
Archify README hero: a tagline and a browser window showing a service architecture diagram in dark and light themes.
archifySystem diagrams for coding-agent users★ 63.6k▲ +1,307MITpermissive—
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
PartModeMechanical CAD in the browserTHIS ENTRY★ 526—AGPL-3.0copyleftweb
toeverything/affineCARD★ 72.5k▲ +8Licence unconfirmedunconfirmed—
penpot/penpotCARD★ 59.9k▲ +10MPL-2.0permissive—

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TIMELINE

  1. Repository created
  2. FIRST SEEN BY TESIGN ◌ BACK CATALOG