Brickworks
Menu
How it compares with Studio

A CAD for LEGO® models, in your browser

Every LDraw part at true size, joined where the real ones join and turned to any angle. See whether your model stands, turn its gears and print its booklet. Nothing to install, and free.

Open the app Download for desktop

On a computer, a tablet or a phone, and on Windows, macOS and Linux.

The Brickworks builder with a castle of 2,438 parts open and its gatehouse selected: menus and a toolbar across the top; down the left the parts bin, the model tree of its sub-assemblies, and the gatehouse's properties, a sub-assembly of 406 parts; the view cube at top right; and in the middle a stone castle with towers, a moat and a courtyard, the gatehouse outlined in yellow.

How it works

From the first brick to the booklet

Your first model

  1. Find the part

    Any of LDraw’s parts, by its BrickLink or Rebrickable name, an element number, or a photo of the real one.

  2. Put it where it goes

    Studs, pins, axles and clips join where the real ones do, and nothing goes through anything. Turn a part by quarter turns, to the degree, or to any angle you type.

  3. Check it, then build it

    See where it would tip and which joints would give, set out the steps, then print the booklet or take the parts list to BrickLink or Rebrickable.

In the app

Built for builds that have to work

How it compares
  • Tools, Check stability on an arm reaching far past a small base: the base's footprint drawn on the floor in red, the centre of mass marked beyond its edge with a line to it, and the joints carrying more than they can hold tinted a lighter red.
    Will it stand?Where it tips, which joints carry more than they can hold, and what would fix each.
  • Tools, Simulate mechanism on an orrery of the Sun and eight planets: the panel lists each planet's period in Earth years beside the real one, every one within 0.3%, and the gear trains tinted by speed.
    Gears at their real ratiosThey mesh as you put them down. Turn the crank and every train turns: an orrery’s planets within 0.3% of their real years.
  • A page of the building instructions for a small red car: steps 5 to 8, each with a box of the parts it adds above a drawing of the car so far, and a progress bar and the page number along the foot.
    BookletsSet the order and the pages, then print it like the one in the box, or save it as a PDF.

  • Your Studio files

    Open BrickLink Studio .io files, with the parts only Studio has, and LDraw and LEGO® Digital Designer ones.

  • Grab it like the real thing

    A boom swings on its hinges, steering turns on its rack, an actuator stretches.

  • Build together, live

    One model built by several people at once, by a link, each seeing the others’ parts go down.

  • Renders and 3D export

    Renders up to 4K, 3D export at true size, and parts lists for BrickLink and Rebrickable.

  • Big models, in sections

    Sub-assemblies, copies that change with their original, and sections, as big sets are built.

  • Phones and tablets too

    The whole builder, laid out for a finger, and your models on every device you sign in on.

And minifigures, prints and stickers, hoses and chains, mosaics, parts made to any size, and what your own sets can build. All of it, in the docs

The gallery

Made in Brickworks

See the gallery

The LDraw library

Real sets, ready to open

Every LEGO® set, each with a page of its own, its picture and its parts to build from. Those the LDraw community has modelled open in the builder whole.

Browse the library

Optional

Bring your own assistant

Brickworks is made for building by hand. If you want help, turn on your own Claude: it can put a model together from a sentence, change the parts you select, or answer a question about it.

How the assistant works How to bring your Claude
  • Off until you turn it on. Off, there is no AI anywhere in the window.
  • Held to the same checks. It builds with the same real parts, and the app decides whether each one fits and holds.
  • You stay in charge. Change anything it puts down; a whole design is one Undo.
  • Never limited. It runs on your own Claude plan or key, never billed by Brickworks.

Web and desktop

In your browser. On your desktop.

In any browser

The whole builder at brickworks.diy/app: on a computer, a tablet or a phone, with nothing to install. Your models follow you to every device you sign in on.

Open the app

Windows, macOS and Linux

The desktop app works offline with every part on disk and handles the biggest models. It is free, like the web app.

Download

Plans

Free on the web and the desktop. Pro is coming.

Free for personal and educational use. Pro keeps every model you make and adds a licence to sell what you make.

Free

$0

  • The web app and the desktop app, for Windows, macOS and Linux
  • Help from your own assistant, without a limit
  • 25 models kept with your account
Open the app

Pro

Coming soon

$8 a month, or $80 a year

  • Everything in Free
  • Every model kept with your account
  • Commercial use, to sell what you make
  • Students and teachers get it free
See the plans

Had an account before 29 October 2026? You keep everything. What that means

Build something today

Open Brickworks in your browser and start from one brick, a real set or your own Studio file.

Open the app Browse the gallery