Design virtual models you can build with LEGO® bricks

Easy to Use

LeoCAD has an intuitive interface that is designed to allow new users to start creating new models without having to spend too much time learning the application.

At the same time, it has a rich feature set that enables experienced users to build models by using techniques that are more advanced.

LDraw Compatible

LeoCAD is fully compatible with the LDraw Standard and related tools, and it reads and writes LDR and MPD files so that you can share and download models from the Internet.

It also uses the LDraw parts library, which has almost 10,000 different parts and continues to receive updates.

Cross Platform, Open Source

Native versions are available for Windows, Linux and macOS to ensure that users are familiar with the program interface.

LeoCAD is open-source, so anyone can contribute with fixes and features, and it is always going to remain free.


LeoCAD is optimized for large models; here is the Tower Bridge, an official set with over 4,000 pieces:


The application can be used to create building instructions with multiple steps:


The application also allows multiple views at the same time:


LEGO® is a trademark of the LEGO Group of companies which does not sponsor, authorize or endorse this software.