3DCad Studio

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A free, privacy-first in-browser 3D CAD modeler featuring Dual CAD architecture (OpenCASCADE B-Rep and mesh CSG), 2D constraint solving, kinematic assemblies, and an on-device local AI assistant.

3DCad Studio main Dual CAD viewport with parametric gear reducer assembly and 3D printing build plate

Cost / License

Free
Open Source (MIT)

Application typeApplication types

Origin

Brazil

Since

Updated

Updated Nov 2026

Platforms

Online

High-density 3D mesh rendering (T-800 Endoskull with 160k+ triangles) on the 3D printing build plate with real-time volume and weight estimates

3DCad Studio alternatives

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Properties

Lightweight
AI-Powered

Features

Ad-free
Dark Mode
Live Preview
No Coding Required
Parametric Modeling
No registration required
Procedural Modeling
Works Offline
Progressive Web App
3D Printing

3DCad Studio information

Developed by
4U.IA.BR
Licensing
Open Source (MIT) and Free product.
Written in
JavaScript
Alternatives
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Supported Languages
- English
- Portuguese

AlternativeTo Category

Photos & Graphics

GitHub repository

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0 Forks
0 Open Issues
Updated Nov 2, 2026

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3DCad Studio was added to AlternativeTo by Fabiano Braga on Nov 3, 2026 and this page was last updated Nov 3, 2026.

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What is 3DCad Studio?

3DCad Studio is a free, open-source parametric 3D CAD modeling suite and 3D printing workbench running 100% in your browser. Built on a private, client-side architecture, all geometry, B-Rep topology, mesh operations, and rendering compute locally via WebAssembly and WebGL—with zero telemetry, no tracking, and no cloud dependencies.

🌟 Key Capabilities & Architecture

Dual CAD Engine: Combines exact analytic boundary-representation (B-Rep powered by OpenCASCADE Technology 7.8 in a dedicated Web Worker) with fast mesh modeling and CSG Boolean operations (Union, Subtract/Drill, Intersect via Three.js BSP).
Local On-Device AI Assistant: Embedded in the Help Center, a local semantic RAG assistant answers technical modeling, tolerance, and manufacturing questions in real time. Features native support for Chrome Built-in AI (Gemini Nano on-device), ensuring total privacy with zero cloud requests.
Large Mesh Handling: Non-blocking stride decimation handles dense STL and 3MF files up to 150 MB and over 1,000,000 polygons without freezing the browser interface.
2D Sketcher & Constraint Solver: 2D sketching environment with a damped Levenberg-Marquardt solver featuring Jacobian QR rank analysis, Degrees of Freedom (DOF) tracking, and 16 geometric constraints with 3D Extrusion and 360° Revolve.
Kinematic Multi-Body Assemblies: Link parts with physical joints (Revolute, Slider, Fixed, Ball) with stroke/angle limits, forward kinematics, and interactive real-time simulation.
Parametric Mechanical Generators: Generate involute spur gears, metric fasteners (M3–M20 bolts and nuts), 608 bearing pillow blocks, L-brackets, plates, and electronic enclosures with snap-fit lids in one click.
Analytic Edge Finishing: Apply true mathematical Fillet, Chamfer, and Hollow Shell operations powered by OpenCASCADE WASM without topology degradation.
3D Printing Workbench Tools: One-click "Drop to Bed (Z=0)", 3D caliper, real-time filament/resin weight estimation (PLA, PETG, ABS, Resin), and manifold mesh validation.
Universal File Interoperability: Universal file loader supporting .STL, .3MF (multipart/multicolor ZIP), .STEP/.STP (analytic B-Rep and faceted mesh), and native .JSON parametric project documents.

🔒 Privacy & Offline Freedom