LeoCAD
LeoCAD is a free, open-source CAD application for creating virtual LEGO models. It features an intuitive interface suitable for beginners while offering advanced tools for experienced builders. The app is fully compatible with the LDraw Standard, reads and writes LDR and MPD files, and includes access to the LDraw parts library with over 10,000 different pieces. LeoCAD is cross-platform with native versions for Windows, Linux and macOS, and is actively maintained by its open-source community.
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1 suggestionLeoCAD was built on Qt, which did not release stable Apple Silicon support until late September 2021. As of our latest information (March 2026), there is no confirmed native Apple Silicon build of LeoCAD in regular distribution, though the project remains actively developed. The app currently runs under Rosetta 2 on M-series Macs but will stop working when Apple removes Rosetta in macOS 28 (September 2028). Check the official LeoCAD website and GitHub repository for announcements about a native build — the developer may have already compiled one since the Qt framework itself has been capable for several years. If a native version is not yet available, contact the project maintainers directly to ask about Apple Silicon support before the Rosetta deadline. As an alternative for LDraw model editing on native Apple Silicon, consider LPub3D, which has partial native support and can integrate with Blender for rendering.
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