Version 0.20 · 30-day free trial
Parametric 3D CAD,
Parametric 3D CAD,
from sketch to shop drawing.
Thin Cad builds parts, sheet metal, assemblies, welds and 2D drawings from an editable history of features. Change a dimension and everything after it rebuilds.
- 4Document types
- 5Platforms incl. web
- 30 daysFree trial
ModelSheet MetalSketchAnnotateInspect
✎Sketch
⬆Extrude
↻Revolve
◠Fillet
▢Shell
◎Hole
Browser
▸ Origin
▾ Bodies
Body1
Sketch1
Extrude1
Fillet1
Hole1
Extrude
Profile1 selected
Distance24 mm
DirectionOne side
OperationJoin
Taper0°
OKCancel
History
Sketch1
Extrude1
Fillet1
Hole1
Parts·Sheet metal·Assemblies·Welds·2D drawings
Features
One app for the whole design
Model the part, unfold the sheet, put the assembly together, weld it and document it, all in Thin Cad.
Constraints
Dimensions
Parameters
Configurations
Extrude
Revolve
Fillet
Chamfer
Shell
Press Pull
Rib
Emboss
Loft
Sweep
Coil
Pipe
Pattern
Mirror
Move / Copy
Hole
Thread
Work Planes
Project
Roll Back History
Sheet Rules
Flange
Hem
Fold
Unfold
Refold
Flat Pattern
Sheet Cut
Bend Table
DXF Export
Place Parts
Mate
Flush
Angle
Tangent
Insert
Joints
Drive Joints
Motion Study
Contact
Welds
Bill of Materials
Sheets
Base View
Projected View
Section View
Detail View
Dimensions
Centre Lines
Surface Texture
Datums
GD&T Frames
Welding Symbols
Parts List
Balloons
PDF Export
DXF Export
Prompt to Model
Prompt to Drawing
Edit by Chat
One Undo per Message
Local Models
MCP Server
Desktop Apps
Browser App
Command Search
Shortcuts
Autosave and Recovery
3D Mouse
3 Languages
CLI and Scripts
AI
Describe it. Thin Cad builds it.
Type what you need in plain language and watch the model or drawing appear in the window, as real, editable features.
Desktop app. Connects to an AI agent or model you already use, such as Claude Code, Codex, or Ollama on your own computer.
Workspaces
Four documents, one workflow
On the Home page, choose New Part, New Sheet Metal, New Assembly or New Drawing.
Build parts from a feature history
Start a sketch on a plane or a flat face, dimension it and finish it. Then extrude or revolve it into a solid. Every step stays editable in the History bar.
- Dimensions take expressions and named parameters
- Project model edges into a sketch as linked geometry
- Slice Graphics cuts the model away so you can see sketches on hidden planes
Sheet metal that keeps its flat pattern
Sketch a base shape and flange it, then add edge flanges, hems, folds, cuts and holes. The flat pattern is always available, with its bend lines and bend table.
- Sheet rules set thickness, bend radius, K-factor and reliefs
- Holes become cut-outs in the flat pattern
- Export DXF layers and a CSV bend table
Assemblies with constraints, joints and welds
Place saved parts. The first is grounded and new ones are set down beside existing parts. Position them exactly with constraints, define motion with joints, and join them with welds.
- Mate, Flush, Angle, Tangent and Insert constraints
- Motion studies and collision contact
- Fillet and groove welds that follow the parts
2D drawings from your parts and assemblies
Lay out sheets with base, projected, section and detail views. Add dimensions, GD&T, welding symbols, a parts list and balloons, then export to PDF or DXF.
- Welding symbols read their size and length from the weld they point at
- Each view has its own scale, hidden edges and centre marks
- First- or third-angle projection, A4 to A0 and ANSI sheets
Get started
Your first part in five steps
- 1
New Part
On the Home page choose New Part, or open a recent file.
- 2
New Sketch
Pick the XY, XZ or YZ plane, or a flat face of the model.
- 3
Draw and dimension
Use Line L, Rectangle, Circle and Arc, then Dimension D.
- 4
Extrude or Revolve
Click Finish Sketch and turn the profile into a solid.
- 5
Save
Press Ctrl+S. A recovery copy is kept while you work.
Handy shortcuts
SSearch commands
LLine
DDimension
PProject
JJoint
F6Fit everything
Ctrl+ZUndo
EscCancel command
Files
Works with the formats you already use
Open STEP, IGES, STL and 3MF files, and export to STEP, STL, 3MF, PDF and DXF.
Thin Cad documents
.thincad | A part (solid or sheet metal) with its full feature history |
|---|---|
.thincad-sheet | A sheet metal part |
.thincad-assembly | An assembly: links to part files, their placements, constraints, joints and welds |
.thincad-drawing | A 2D drawing of a part or assembly, with its sheets, views and annotations |
Import and export
Import
STEPIGESSTL3MF
Export models
STEPSTL3MFand others
Export drawings
PDFDXF
Flat patterns
DXFBend table CSV
Pricing
Pick the plan that fits your work
Every plan runs on Windows, macOS, Linux, FreeBSD and in the browser. Try every feature free for 30 days, no card needed.
Standard
For individual designers making parts and drawings.
$24/ month
Billed $290 yearly
Start free trial- Parts with full feature history
- Sketches, constraints and parameters
- Holes, threads and patterns
- 2D drawings with PDF and DXF export
- STEP, IGES, STL and 3MF import and export
- 1 user, 2 devices
- Email support
Professional
For engineers working with sheet metal, assemblies and welds.
$49/ month
Billed $590 yearly
Start free trial- Everything in Standard, plus:
- Sheet metal, flat patterns and bend tables
- Assemblies, joints and motion studies
- Fillet and groove welds, welding symbols
- GD&T, parts lists, BOM and balloons
- AI prompting, CLI, scripts and MCP access
- Priority email support
Enterprise
For teams that need volume licensing and onboarding.
Custom
Volume pricing from 10 seats
Contact sales- Everything in Professional, plus:
- Floating and site licences
- Central licence management
- Onboarding and training sessions
- Dedicated account manager
- Phone support with SLA
Students and teachers get 50% off Professional with a valid school email. Prices are in USD and exclude taxes.
FAQ
Frequently asked questions
How much does Thin Cad cost?
Standard is $29 a month, Professional is $59 a month, and both are cheaper billed yearly. Enterprise pricing depends on the number of seats. Every plan starts with a 30-day free trial with all features.
What happens when my trial ends?
Choose a plan to keep working. If you don't, your designs stay on your computer and you can still open and view them, but editing and export are locked until you subscribe.
Can I switch plans or cancel?
Yes. Upgrade or downgrade at any time and the difference is prorated. Cancel whenever you like, and your plan stays active until the end of the period you paid for.
What can I design with it?
Solid parts, sheet metal parts with flat patterns, assemblies with constraints, joints and welds, and 2D drawings of any of them with dimensions, GD&T, parts lists and balloons.
Can I open files from other CAD tools?
Insert brings in STEP, IGES, STL and 3MF. File ▸ Export writes STEP, STL, 3MF and others. Drawings export to PDF and DXF, and sheet metal flat patterns export to DXF.
What happens if Thin Cad closes unexpectedly?
Thin Cad saves a recovery copy while you work and offers to recover the design the next time it starts. Help ▸ Crash Reports shows what happened, including the steps to reproduce it.
The window doesn't open. What should I try?
Update your graphics driver first. Over Remote Desktop or in a virtual machine, turn on 3D acceleration. You can also start Thin Cad once with --safe-mode, or rename the settings folder.
What do I need to use the AI feature?
The desktop app, plus an AI agent or model you already use. It can be a coding agent on your own account, such as Claude Code or Codex, or a model behind an OpenAI-compatible endpoint, such as Ollama on your computer. Everything the AI changes in answer to one message is a single undo step.
Which languages are available?
English, Japanese and Chinese. Change it under Settings, along with units, theme, autosave interval and keyboard shortcuts.
Download Thin Cad
Start your 30-day free trial. Pick your platform, or run it in your browser.